Database Users

Warning!

Some people said that you can update your lovely device to the Chinese firmware version. That is true! It works. However, motorola updated the bootloader version for the Chinese firmware. If can never downgraded to the original 5.0 for XT1095 or others because the bootloader does not support that. Here are three ways for you if you do not want to use the Chinese firmware: The first one is what I did which is to contact Motorola and replace a phone for FREE. The second one is to flash the XT1092's 5.0.2. It works too although I did not try that. The third way is to wait the official 5.0.2 firmware for XT1095.
Just a warn to those who want to update your lovely device

zhangyang_haha said:
Some people said that you can update your lovely device to the Chinese firmware version. That is true! It works. However, motorola updated the bootloader version for the Chinese firmware. If can never downgraded to the original 5.0 for XT1095 or others because the bootloader does not support that. Here are three ways for you if you do not want to use the Chinese firmware: The first one is what I did which is to contact Motorola and replace a phone for FREE. The second one is to flash the XT1092's 5.0.2. It works too although I did not try that. The third way is to wait the official 5.0.2 firmware for XT1095.
Just a warn to those who want to update your lovely device
Click to expand...
Click to collapse
I think is precipitated to say "never"
The boot loader on the Chinese version is new I agree. But eventually Motorola will upgrade all the boot loaders to that version, even the Pure editon. When Motorola will decide to upgrade all to the new motoboot even the pure pure edition won't be able to return to <5.0.2.
So, you can try it yes, just avoid to flash Motoboot.img

Flashing any 4.4.4 to any 5.x already updates the bootloader and it cannot be downgraded. You can downgrade all of the other files though and the phone will work just fine.
Have you tried manually flashing(mfastboot) all of the other files to downgrade? If they are preventing the downgrade of the entire OS this is something new, and to be honest I don't believe that they are.

zhangyang_haha said:
Some people said that you can update your lovely device to the Chinese firmware version. That is true! It works. However, motorola updated the bootloader version for the Chinese firmware. If can never downgraded to the original 5.0 for XT1095 or others because the bootloader does not support that. Here are three ways for you if you do not want to use the Chinese firmware: The first one is what I did which is to contact Motorola and replace a phone for FREE. The second one is to flash the XT1092's 5.0.2. It works too although I did not try that. The third way is to wait the official 5.0.2 firmware for XT1095.
Just a warn to those who want to update your lovely device
Click to expand...
Click to collapse
Before using RSDLite you must replace the files of KitKat (gpt.bin and motoboot.img) with those firmware Lollipop otherwise you can not do the downgrade. I pass easily from 4.4.4 to 5.0.2 and 5.0 and my Moto X XT1092 works perfectly.

Steve-x said:
Flashing any 4.4.4 to any 5.x already updates the bootloader and it cannot be downgraded. You can downgrade all of the other files though and the phone will work just fine.
Have you tried manually flashing(mfastboot) all of the other files to downgrade? If they are preventing the downgrade of the entire OS this is something new, and to be honest I don't believe that they are.
Click to expand...
Click to collapse
solocchi said:
Before using RSDLite you must replace the files of KitKat (gpt.bin and motoboot.img) with those firmware Lollipop otherwise you can not do the downgrade. I pass easily from 4.4.4 to 5.0.2 and 5.0 and my Moto X XT1092 works perfectly.
Click to expand...
Click to collapse
actually you can downgrade via TWRP, just flash the restore files of system and boot
Via Fastboot you cannot downgrade because when you are trying to flash the system.img the phone says image is too large, although the fastboot windows says OK but the phone will stuck at logo.
Via RSD I have not tryed, but maybe later today will do.
Resuming, if you flash via fastboot the motoboot.img you wont be able to flash system images older than the version the bootloader is meant to, but if you use any other method you can easily downgrade and upgrade.

Steve-x said:
Flashing any 4.4.4 to any 5.x already updates the bootloader and it cannot be downgraded. You can downgrade all of the other files though and the phone will work just fine.
Have you tried manually flashing(mfastboot) all of the other files to downgrade? If they are preventing the downgrade of the entire OS this is something new, and to be honest I don't believe that they are.
Click to expand...
Click to collapse
Of course. I've tried manually flash except motoboot or gpt.
This will just make your phone sucks at the boot logo

juliospinoza said:
I think is precipitated to say "never"
The boot loader on the Chinese version is new I agree. But eventually Motorola will upgrade all the boot loaders to that version, even the Pure editon. When Motorola will decide to upgrade all to the new motoboot even the pure pure edition won't be able to return to <5.0.2.
So, you can try it yes, just avoid to flash Motoboot.img
Click to expand...
Click to collapse
I mean we can never downgrade the bootloader.

juliospinoza said:
actually you can downgrade via TWRP, just flash the restore files of system and boot
Via Fastboot you cannot downgrade because when you are trying to flash the system.img the phone says image is too large, although the fastboot windows says OK but the phone will stuck at logo.
Via RSD I have not tryed, but maybe later today will do.
Resuming, if you flash via fastboot the motoboot.img you wont be able to flash system images older than the version the bootloader is meant to, but if you use any other method you can easily downgrade and upgrade.
Click to expand...
Click to collapse
So, you mean we can make a flashable zip and flash it in the TWRP right? that is possible. I forget this way. Fell so sorry about that

zhangyang_haha said:
S...... The second one is to flash the XT1092's 5.0.2. It works too although I did not try that. ....
Click to expand...
Click to collapse
Where do you see a 5.0.2 firmware available for XT1092? I have not seen one. The only 5.0.2 available is for XT1085. Am I missing something here?

sha_tan said:
Where do you see a 5.0.2 firmware available for XT1092? I have not seen one. The only 5.0.2 available is for XT1085. Am I missing something here?
Click to expand...
Click to collapse
Android development section

juliospinoza said:
Android development section
Click to expand...
Click to collapse
I think that is a TWRP backup image right?

Flashable zips for system and radio would be the simplest thing for everyone. I would love to create them but don't even know where to start. Is there a reason no one has done it yet? That is the first thing to happen for nexus devices.

zhangyang_haha said:
Some people said that you can update your lovely device to the Chinese firmware version. That is true! It works. However, motorola updated the bootloader version for the Chinese firmware. If can never downgraded to the original 5.0 for XT1095 or others because the bootloader does not support that. Here are three ways for you if you do not want to use the Chinese firmware: The first one is what I did which is to contact Motorola and replace a phone for FREE. The second one is to flash the XT1092's 5.0.2. It works too although I did not try that. The third way is to wait the official 5.0.2 firmware for XT1095.
Just a warn to those who want to update your lovely device
Click to expand...
Click to collapse
how did you get them to replace it for free? within 14 days of purchase?

supercoolman said:
how did you get them to replace it for free? within 14 days of purchase?
Click to expand...
Click to collapse
Yes, its in 14 days. Because I was developing Mokee for XT1095, i unlocked my phone. I'm always dare to try every new thing

Unlocked Amazon XT1625 to retail firmware?

So, I have a 32gb Amazon-variant XT1625 on MPJ24.139-48 with an unlocked bootloader and root. I want to update to Nougat, but it's looking like setting up to take the Amazon update is going to be a fair amount of effort; I'm wondering if it's possible to just flash the retail version of Nougat since it's looking like I'm going to have to go to a fair sum of effort anyway.
I've also heard that Moto G4 Plus ROMs will work on the G4, but I don't know the specifics on that.

i dont see why not as long as you already unlocked the bootloader prior to Moto(Lenovo) disallowed unlocking of amazon varients of the g4. heres a link to the stock nougat firmware
https://androidfilehost.com/?fid=673368273298955218

I flashed -64 retus software on mine and it immediately had two nougat updates afterwards. Still waiting for one that fixes the aboot sector vulnerability too but never know when that may come

Travisholt92 said:
I flashed -64 retus software on mine and it immediately had two nougat updates afterwards. Still waiting for one that fixes the aboot sector vulnerability too but never know when that may come
Click to expand...
Click to collapse
then you was able to flash retail version in a amazon prime phone? I have one and it dont boot if i instal a retail version.

di anybody actually get this working? I had the same issue as @iurd2007 I was able to unlock the bootloader just fine. The flash appeared to have taken successfully. But it just gets caught in a boot loop when trying to reboot the system after the flash. I followed the instructions here:
https://forum.xda-developers.com/moto-g4-plus/how-to/stock-rom-npjs25-93-14-4-march-1-t3608138

okay, so i've tried various roms both official and unofficial, as well as even the stock Nougat and Oreo flashable roms found here:
https://forum.xda-developers.com/moto-g4-plus/development/rom-oreo-8-1-0-soak-test-t3873367
So far, the only ROM i've been able to get installed is omni rom 9, but it keeps crashing several apps over and over on the setup wizard. I've read somewhere that using a different version of TWRP recovery image might help. I've tried the official TWRP recovery from twrp.me, the patched arm64 version found here: https://sourceforge.net/projects/tw...3-r1-athene-arm64_rajatgupta1998.img/download , also the latest version patched for efs backup/restore here: https://forum.xda-developers.com/devdb/project/?id=29106#downloads. So far the the one that seems to work the best is the third version of TWRP. It would be nice if all these custom patches made it back into an official release, but it's probably asking a lot of a phone that is almost 4 years old at this point. and a budget friendly phone at that.

What firmware for XT1681

Hey there !
I have a Moto G5 Plus International edition (XT1681) with firmware NPNS25.137-92-4 (latest January Patch).
I want to know what firmware to download from here (https://firmware.center/firmware/Motorola/Moto G5 Plus/Stock/) for factory flash not to get bricked like an idiot.
I don't know which one is good
Thanks

The last 2 ROMs are for your device, if you have a custom recovery I recommend to install the flashable version from this link .
https://forum.xda-developers.com/g5-plus/development/rom-twrp-flashable-stock-builds-t3675616
Here are the same version of your device NPNS25.137-92-4 (20180101 security patch)

Oh nice !
Is it OK to OTA update on these flashable .zip ? As I have also modified the kernel which is not stock anymore :/

CobraBoyFR said:
Oh nice !
Is it OK to OTA update on these flashable .zip ? As I have also modified the kernel which is not stock anymore :/
Click to expand...
Click to collapse
i didnt try to flash over a fastboot rom, maybe you cant do that.

Thanks
But basically, what I need is flashing full stock firmware (with recovery and kernel), no matter if it's january update or not. Just the factory images I had when I bought the phone. And I don't know what version is OK for my phone (XT1681 with NPNS25.137-92-4 now) 'cause I don't want to hard brick it when OTA updating (to Oreo for example)

From your link the last 2 ROMs are the same so you can use both.
You are on stock right? Do you planning on flashing custom ROMs? If you flash Oreo ROMs and you want to downgrade flashing fastboot rom maybe you lost volte.

RokCruz said:
From your link the last 2 ROMs are the same so you can use both.
You are on stock right? Do you planning on flashing custom ROMs? If you flash Oreo ROMs and you want to downgrade flashing fastboot rom maybe you lost volte.
Click to expand...
Click to collapse
Right now I'm on stock NPNS25.137-92-4, with TWRP recovery + Magisk root + ElementalX kernel
I'm not planning to flash any custom ROM for the moment. When the official Oreo update comes out, I want to update. But I know it won't go well if I OTA update it with my current configuration. That's why I want to be able to flash stock with fastboot (rough clean install), no matter what version I get : All i want is to be able to update to Oreo when it's out. Problem is, I don't know which image I need to download from here : https://firmware.center/firmware/Motorola/Moto G5 Plus/Stock/
I know it's there, but don't know exactly the good version.

This is for our device xt1681
https://firmware.center/firmware/Mo...ubsidy-DEFAULT_regulatory-DEFAULT_CFC.xml.zip
I'm on flashable stock with ex kernel and magisk, when the Oreo ota start rolling out I'll wait for flashable rom so I'll can upgrade (dirty flash) so I don't loose anything.

RokCruz said:
This is for our device xt1681
https://firmware.center/firmware/Mo...ubsidy-DEFAULT_regulatory-DEFAULT_CFC.xml.zip
I'm on flashable stock with ex kernel and magisk, when the Oreo ota start rolling out I'll wait for flashable rom so I'll can upgrade (dirty flash) so I don't loose anything.
Click to expand...
Click to collapse
If your device was flashed with stock firmware newer than NPN25.137-15, I would strongly advise against flashing the NPN25.137-15 stock firmware.
The reason is that downgrading stock firmware downgrades your system, but not usually your bootloader (your bootloader will likely report a security downgrade/pre-flash validation error). As such, you'll have a newer bootloader but older system (in terms of patch levels). For example, you have the NPNS25.137-92-4 stock firmware (before flashing TWRP), so your bootloader is the Jan 2018 patch level. You flash this NPN25.137-15 firmware - you have a Jan 2017 system, but still a Jan 2018 bootloader.
The downgrade generally goes okay. However, taking OTA updates with this mismatch in bootloader and system is generally what results in hard bricks; the OTA update checks for your system patch level - in the above example, you'll probably get the OTA update to upgrade from NPN25.137-15... However, your bootloader is not the NPN25.137-15 patch level bootloader, as such your bootloader may get overwritten by the OTA and gets corrupted in the process, leading to hard bricks. This scenario isn't just applicable for the NPN25.137-15 update, this potentially applies if you flash a stock firmware older than what was on your device and then attempt to use OTA updates (unless you could flash the stock firmware directly preceding the firmware you had).
Easiest way is to re-flash the same stock ROM build you had before flashing TWRP. I don't see any NPNS25.137-92-4 stock ROMs leaked yet from the Motorola Firmware Team page https://androidfilehost.com/?a=show&w=files&flid=171014 or firmware.mirror but hopefully they'll be along soon.
If you're on stock NPNS25.137-92-4, in theory you could flash NPN25.137-92 (the build directly before the NPNS25.137-92-4 Jan 2018 security update), so the next OTA update would update your device to NPNS25.137-92-4 - the OTA would be simply patching your device to the same build it's currently on and in theory that should work. NPN25.137-92 is one of the firmwares currently available so may be worth thinking about. Best thing though is to flash the NPNS25.137-92-4 firmware or newer firmware that is the correct build for XT1681 devices.

echo92 said:
If your device was flashed with stock firmware newer than NPN25.137-15, I would strongly advise against flashing the NPN25.137-15 stock firmware.
The reason is that downgrading stock firmware downgrades your system, but not usually your bootloader (your bootloader will likely report a security downgrade/pre-flash validation error). As such, you'll have a newer bootloader but older system (in terms of patch levels). For example, you have the NPNS25.137-92-4 stock firmware (before flashing TWRP), so your bootloader is the Jan 2018 patch level. You flash this NPN25.137-15 firmware - you have a Jan 2017 system, but still a Jan 2018 bootloader.
The downgrade generally goes okay. However, taking OTA updates with this mismatch in bootloader and system is generally what results in hard bricks; the OTA update checks for your system patch level - in the above example, you'll probably get the OTA update to upgrade from NPN25.137-15... However, your bootloader is not the NPN25.137-15 patch level bootloader, as such your bootloader may get overwritten by the OTA and gets corrupted in the process, leading to hard bricks. This scenario isn't just applicable for the NPN25.137-15 update, this potentially applies if you flash a stock firmware older than what was on your device and then attempt to use OTA updates (unless you could flash the stock firmware directly preceding the firmware you had).
Easiest way is to re-flash the same stock ROM build you had before flashing TWRP. I don't see any NPNS25.137-92-4 stock ROMs leaked yet from the Motorola Firmware Team page https://androidfilehost.com/?a=show&w=files&flid=171014 or firmware.mirror but hopefully they'll be along soon.
If you're on stock NPNS25.137-92-4, in theory you could flash NPN25.137-92 (the build directly before the NPNS25.137-92-4 Jan 2018 security update), so the next OTA update would update your device to NPNS25.137-92-4 - the OTA would be simply patching your device to the same build it's currently on and in theory that should work. NPN25.137-92 is one of the firmwares currently available so may be worth thinking about. Best thing though is to flash the NPNS25.137-92-4 firmware or newer firmware that is the correct build for XT1681 devices.
Click to expand...
Click to collapse
In few words we only can flash ROMs with the same compilation number or higher to avoid hard brick right?

RokCruz said:
In few words we only can flash ROMs with the same compilation number or higher to avoid hard brick right?
Click to expand...
Click to collapse
Pretty much, yes (or at least it minimises the chances of a hard brick). If you really want to flash older stock ROMs, please do not use OTA updates at all. Ignore the OTA prompt or freeze the Motorola OTA updater if you downgraded your stock firmware. It's not fun seeing a £150-200 (or your regional equivalent) device hard bricked.
However, with Motorola's habit of releasing different builds to different regions, please ensure you flash the correct build for your device, else the Motorola servers may not issue OTAs if you're on the incorrect series of builds for your software channel. The latest available leaked firmware for your device appears to be NPN25.137-92 (we don't have access to NPNS25.137-92-4 yet).

echo92 said:
Pretty much, yes (or at least it minimises the chances of a hard brick). If you really want to flash older stock ROMs, please do not use OTA updates at all. Ignore the OTA prompt or freeze the Motorola OTA updater if you downgraded your stock firmware. It's not fun seeing a £150-200 (or your regional equivalent) device hard bricked.
However, with Motorola's habit of releasing different builds to different regions, please ensure you flash the correct build for your device, else the Motorola servers may not issue OTAs if you're on the incorrect series of builds for your software channel. The latest available leaked firmware for your device appears to be NPN25.137-92 (we don't have access to NPNS25.137-92-4 yet).
Click to expand...
Click to collapse
That was roughly what I figured out but damn, those explanations, thanks buddy :highfive:

The January update's bootloader is the same bootloader that the November security patch update has. You can flash the
POTTER_NPN25.137-83_cid50_subsidy-DEFAULT_regulatory-DEFAULT_CFC files from fastboot (skip gpt.bin) then OTA to 93 (November Patch), then OTA to 93-4 (January Patch)
The OTA will not brick the phone since the bootloader the OTA flashes is the same one it is currently on.
Also, this is what I did to get onto the January Patch so I can confirm my phone works fine and did not brick.

driverdis said:
The January update's bootloader is the same bootloader that the November security patch update has. You can flash the
POTTER_NPN25.137-83_cid50_subsidy-DEFAULT_regulatory-DEFAULT_CFC files from fastboot (skip gpt.bin) then OTA to 93 (November Patch), then OTA to 93-4 (January Patch)
The OTA will not brick the phone since the bootloader the OTA flashes is the same one it is currently on.
Also, this is what I did to get onto the January Patch so I can confirm my phone works fine and did not brick.
Click to expand...
Click to collapse
On xt1681 right?
Thanks for your feedback

echo92 said:
Pretty much, yes (or at least it minimises the chances of a hard brick). If you really want to flash older stock ROMs, please do not use OTA updates at all. Ignore the OTA prompt or freeze the Motorola OTA updater if you downgraded your stock firmware. It's not fun seeing a £150-200 (or your regional equivalent) device hard bricked.
However, with Motorola's habit of releasing different builds to different regions, please ensure you flash the correct build for your device, else the Motorola servers may not issue OTAs if you're on the incorrect series of builds for your software channel. The latest available leaked firmware for your device appears to be NPN25.137-92 (we don't have access to NPNS25.137-92-4 yet).
Click to expand...
Click to collapse
yeah i cant apply normal OTA over flashable rom. I was on NPN25.137-92(flashable) i download NPNS25.137-92-4(flashable too) i dirty flashed it and it works perfect without lose my stuff

I ordered XT1681 International version from Amazon.ca. I replaced the recovery with TWRP. I have two questions.
(1) I am prompted to install 137-92-8 via OTA. Where can I find this TWRP flashable ROM for this version ? I am on 137-92-4.
(2) Is there any other compatible stock ROM that I can install on it ? The OTA message is in Spanish. My preference is in English and as long as it supports the dual SIM and the NIC.
Thanks.

jkl555 said:
I ordered XT1681 International version from Amazon.ca. I replaced the recovery with TWRP. I have two questions.
(1) I am prompted to install 137-92-8 via OTA. Where can I find this TWRP flashable ROM for this version ? I am on 137-92-4.
(2) Is there any other compatible stock ROM that I can install on it ? The OTA message is in Spanish. My preference is in English and as long as it supports the dual SIM and the NIC.
Thanks.
Click to expand...
Click to collapse
Just to reply to myself for (2). I found the following link
https://www.stockrom.net/2017/05/st...g5-plus-xt1683-xt1681-android-7-0-nougat.html

[HELP] Downgrade

I m on stock rom unrooted with locked bootloader with built no : NPNS25.137-93-10 (April patch).
So my question is how to switch to NPNS25.137-92-14 (JUNE patch), how to do it ?plz help

Why do you want to change to India/Brazil software, safer to just wait for the US, Europe, Retpac version.
Damn, just noticed retin, just fastboot 92.14.
Then you can update to official oreo

Stable version is releasing soon, wait for sometime.

Smeagal192 said:
Why do you want to chang
Click to expand...
Click to collapse
Isn't it cause to brick or imei 0, if i flash the 92-14 built over my current 93-14.
Is it safe ?

~Unify~ said:
Isn't it cause to brick or imei 0, if i flash the 92-14 built over my current 93-14.
Is it safe ?
Click to expand...
Click to collapse
92-14 is firmware for India and Brazil, 93-14 is for Europe,US and Asia Pacific.
It's possible to flash one over the other but you'll change your software channel and may not receive future OTA.
Better to wait for the 8.1 firmware for your region.
Losing IMEI,volte or 4g most likely only happens when you flash a 64 bit custom ROM.
To be on the safe side make a full nandroid backup incl. EFS and persist with latest TWRP 3.2.3.1
Sent from my Moto G5 Plus using XDA Labs

Wolfcity said:
92-14 is firmware for India and Brazil, 93-14 is for Europe,US and Asia Pacific.
It's possible to flash one over the other but you'll change your software channel and may not receive future OTA.
Better to wait for the 8.1 firmware for your region.
Losing IMEI,volte or 4g most likely only happens when you flash a 64 bit custom ROM.
To be on the safe side make a full nandroid backup incl. EFS and persist with latest TWRP 3.2.3.1
Click to expand...
Click to collapse
Look at the picture, software channel retin with 193-10 installed.
So should be safe to overwrite with latest indian stock release ?

Smeagal192 said:
Look at the picture, software channel retin with 193-10 installed.
So should be safe to overwrite with latest indian stock release ?
Click to expand...
Click to collapse
The name of the software channel doesn't change if you flash another firmware version so it's safe from that point of view.
The only thing that's changing is the fact that you don't receive any OTA updates anymore.
The screenshot of the op only shows that he once flashed a firmware that was meant to be used on a US or european device.
Sent from my Moto G5 Plus using XDA Labs

Wolfcity said:
The name of the software
Click to expand...
Click to collapse
Yes im from india, once in past i unlock bootloader n rooted my phone, but when i tried to lock my bootloader i couldn't, so i tried many fastboot rom and finally flashed and successfully boot up with this us rom. Since that time im using this rom and not get any ota also.

I lost my IMEI after flashing 92-14....HELP HELP

Moto g5 plus stock ROM

I'm having Moto g5 plus Indian variant xt1686. I have installed a custom ROM Resurrection remix and I'm currently running it.I want to get back to stock rom. I went through many existing threads only to get myself confused. I want you guys to help me get back to stock ROM so that I can get OTA updates.
1. I have working volte and IMEI till now. I didn't take back-up of persist or efs as I was lacking knowledge. Can I take back-up of those now for going back to stock. If yes then suggest how?
2. I don't remember my build number from which I unlocked my bootloader. Should I lock the bootloader again to get OTA? If not then please suggest any way to get back to stock whether Oreo or nougat (get updates to Oreo then).

kash664 said:
I'm having Moto g5 plus Indian variant xt1686. I have installed a custom ROM Resurrection remix and I'm currently running it.I want to get back to stock rom. I went through many existing threads only to get myself confused. I want you guys to help me get back to stock ROM so that I can get OTA updates.
1. I have working volte and IMEI till now. I didn't take back-up of persist or efs as I was lacking knowledge. Can I take back-up of those now for going back to stock. If yes then suggest how?
2. I don't remember my build number from which I unlocked my bootloader. Should I lock the bootloader again to get OTA? If not then please suggest any way to get back to stock whether Oreo or nougat (get updates to Oreo then).
Click to expand...
Click to collapse
From what I believe, you should definitely backup your EFS and Persist right now while it's all good.
If you don't remember your last stock build number, it is safe to use the latest build for your region.
Once you flash a fastboot ROM and everything's good to go, there's absolutely no need to relock bootloader as the script in the OTA only checks for system modifications and if it finds any on your phone, the OTA will not be applied and the update will eventually fail. To ensure that you are able to apply OTAs without any hassle, I recommend you don't do ANY system modifications like root or camera mods or similar. Stick with the core OS and you'll be good to go.
You can alternatively use TWRP flashable ROMs by @NZedPred, they're like a newbie-proof solution to getting to stock ROM from virtually any ROM without losing any functionality as they only flash the OS part of the ROM and rarely do any changes to the HW functionality of the ROM like Radios and Sensors. If all else fails, you can always flash a TWRP flashable stock and be ready to go.
Or
You could simply download the Oreo fastboot ROM with the August security patch which is available at the moment but isn't the latest one as the latest October security patch rolled out to RETIN devices just a few days ago so I doubt that the full fastboot ROM would be available this early. But then again, if you flash the Oreo August patch, you can take the OTA to October patch and be just fine.
Note:
But a bit of advice, if you're planning to go back to Nougat using a Nougat fastboot ROM, I'd highly recommend the TWRP flashable as one can mess stuff up while trying to downgrade using a fastboot ROM as Moto phones have problems downgrading. It's all about these two partitions called "gpt" and "bootloader" which when not paying attention to while flashing can cause a hard-brick.
A safer approach would be to skip these two partitions while using a fastboot ROM to downgrade but I'd be honest and would suggest you to wait to be sure this would work as I myself haven't tried this while downgrading from one Android version to another as Oreo bought with itself some Modem and a few other changes in partitions as compared to Nougat.
If I were you, I would wait for some to confirm the part in the "Note" just to be absolutely sure that it'd work.

Thanks for the response
Thanks for your response.
I'll be going with your suggestion and flash the twrp flashable oreo.

psychopac said:
From what I believe, you should definitely backup your EFS and Persist right now while it's all good.
If you don't remember your last stock build number, it is safe to use the latest build for your region.
Once you flash a fastboot ROM and everything's good to go, there's absolutely no need to relock bootloader as the script in the OTA only checks for system modifications and if it finds any on your phone, the OTA will not be applied and the update will eventually fail. To ensure that you are able to apply OTAs without any hassle, I recommend you don't do ANY system modifications like root or camera mods or similar. Stick with the core OS and you'll be good to go.
You can alternatively use TWRP flashable ROMs by @NZedPred, they're like a newbie-proof solution to getting to stock ROM from virtually any ROM without losing any functionality as they only flash the OS part of the ROM and rarely do any changes to the HW functionality of the ROM like Radios and Sensors. If all else fails, you can always flash a TWRP flashable stock and be ready to go.
Or
You could simply download the Oreo fastboot ROM with the August security patch which is available at the moment but isn't the latest one as the latest October security patch rolled out to RETIN devices just a few days ago so I doubt that the full fastboot ROM would be available this early. But then again, if you flash the Oreo August patch, you can take the OTA to October patch and be just fine.
Note:
But a bit of advice, if you're planning to go back to Nougat using a Nougat fastboot ROM, I'd highly recommend the TWRP flashable as one can mess stuff up while trying to downgrade using a fastboot ROM as Moto phones have problems downgrading. It's all about these two partitions called "gpt" and "bootloader" which when not paying attention to while flashing can cause a hard-brick.
A safer approach would be to skip these two partitions while using a fastboot ROM to downgrade but I'd be honest and would suggest you to wait to be sure this would work as I myself haven't tried this while downgrading from one Android version to another as Oreo bought with itself some Modem and a few other changes in partitions as compared to Nougat.
If I were you, I would wait for some to confirm the part in the "Note" just to be absolutely sure that it'd work.
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Thanks for your response.
I'll be going with your suggestion and flash the twrp flashable oreo.

kash664 said:
Thanks for your response.
I'll be going with your suggestion and flash the twrp flashable oreo.
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Make sure to follow the flashing instructions mentioned by the thread OP properly

psychopac said:
Make sure to follow the flashing instructions mentioned by the thread OP properly
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Yes. Hope everything turns out fine

kash664 said:
I'm having Moto g5 plus Indian variant xt1686. I have installed a custom ROM Resurrection remix and I'm currently running it.I want to get back to stock rom. I went through many existing threads only to get myself confused. I want you guys to help me get back to stock ROM so that I can get OTA updates.
1. I have working volte and IMEI till now. I didn't take back-up of persist or efs as I was lacking knowledge. Can I take back-up of those now for going back to stock. If yes then suggest how?
2. I don't remember my build number from which I unlocked my bootloader. Should I lock the bootloader again to get OTA? If not then please suggest any way to get back to stock whether Oreo or nougat (get updates to Oreo then).
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I hope i can help !!

vishalrickz said:
I hope i can help !!
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Sure sir