A2017GV1.2.0B02 Downgrade to Android 6 B10 - ZTE Axon 7 Questions & Answers

Since I'm experiencing a lot of glitches with Android 7, I want to downgrade my phone to android 6 B10, hoping this will stop malfunctioning.
I downloaded the update B10 from the ZTE website and placed it on my sd card.
System Update finds the update, if I press update, will this downgrade my phone without bricking my device?
I know I will lose my internal memory but will I keep my EMEI info and sd card memory?

It won t harm your phone. It will just downgrade.
sent from zte axon 7 with tapatalk

If fully stock, I don't think you'll be able to downgrade to MM. Lemme know if you are successful though!

oleung4 said:
If fully stock, I don't think you'll be able to downgrade to MM. Lemme know if you are successful though!
Click to expand...
Click to collapse
You can downgrade without problems. I've done it a few times already (from 7.1.1 b01). I'm full stock, locked bl and unrooted.

I downgraded today, not without problems. It rebooted fine, than went back to the Axon screen, vibrating sometimes, so it was some sort of bootloop. I went into recovery mode and did a factory reset. After, it restarted and worked fine, I'm now back on android 6 with a factory reset, unfortunately, for me, problems from Nougat update still persist.

Mysteryman22 said:
I downgraded today, not without problems. It rebooted fine, than went back to the Axon screen, vibrating sometimes, so it was some sort of bootloop. I went into recovery mode and did a factory reset. After, it restarted and worked fine, I'm now back on android 6 with a factory reset, unfortunately, for me, problems from Nougat update still persist.
Click to expand...
Click to collapse
Which problems?

Anyone managed to do this downgrade successfully with stock rom not rooted? I dont have my country language to choose after latest nougat update.
Edit:
I managed to downgrade to b10 V1.0. Because of the Nougat update I was not able to update via external SD card although my card was 64GB.
I unzipped the file and placed it to root of internal SD. Did the normal update via settings and all went fine until it started to boot.
Somehow it asked password which I thought it was normal unlock code which i had placed previously, it wasn't.
Factory reset via recovery cleared that problem. All running normally now with marshmallow...
There is not much experts here to just to compare op3 Devs..

Mysteryman22 said:
Since I'm experiencing a lot of glitches with Android 7, I want to downgrade my phone to android 6 B10, hoping this will stop malfunctioning.
I downloaded the update B10 from the ZTE website and placed it on my sd card.
System Update finds the update, if I press update, will this downgrade my phone without bricking my device?
I know I will lose my internal memory but will I keep my EMEI info and sd card memory?
Click to expand...
Click to collapse
i want to downgrad like my phone without unloacking bootloader but from oreo to marshmallow , help me please how did u do that and if u do that without unoacking bootloader , my phone is "zte axon 7 a 2017 g"

joaste said:
You can downgrade without problems. I've done it a few times already (from 7.1.1 b01). I'm full stock, locked bl and unrooted.
Click to expand...
Click to collapse
tell me please can i downgrading from oreo to marshmallow on my phone a2017g without unloack bootloader !!

joaste said:
You can downgrade without problems. I've done it a few times already (from 7.1.1 b01). I'm full stock, locked bl and unrooted.
Click to expand...
Click to collapse
please tell me the version that u used and from where if u can give me the link ,

Related

unbricking hard brick - moto x style

hey guys
i just brick my phone (no idea how, flashed android 7 firmware) after flash my phone was working for like 2 hours, then i let himself update a security options. After update my phone went brick
As far i found :
- installed Qualcoom QDLOADER 9008 driver
- found QFIL programmer
i need to have programmer path (something related to JTAG) and build xmp path
Where i can find them? Or is it a other way to resscue my phone?
I feel your pain. My timeline:
- The phone was unlocked but still in Stock Nougat (7.0?). Got that from OTA in Brazil.
- I tried to update to LineageOS 7 via TWRP. After a full wipe (everything, system, data, card, cache etc) I installed the new ROM. Turned on, bootlooped forever.
- Searching around I found out that there was no modem in the Nougat roms and for some reason I needed to flash a Marshmallow modem for my region to make that work (I think there is no Nougat modems around or something).
- I found a LA_DS modem for 6.0, flashed that using TWRP, still bootloop. Tried other roms using TWRP, still bootloop.
- I then downloaded a full stock old 6.0 firmware to go back to stock but the phone wouldn't accept some files ("preflash validation failed").
- Searched around and found out that you can't downgrade a bootloader from Moto.
- Using fastboot, I flashed the files the phone was willing to accept and it finally booted the 6.0 Marshmallow stock rom, but with no networking (radio/modem/baseband/IMEI missing).
- Flashed the 6.0 modem for my region again and everything worked. Connected on WiFi, dual sim cards detected etc.
- I started to install every update the phone showed to try to update it back to latest MM version.
- The three first updates went ok, the fourth turned off the phone to never turn on again.
Looks like there is no way out of this. My phone is pretty old and MotoCare in Brazil will charge a lung and a half for repair.
dsnunes said:
I feel your pain. My timeline:
- The phone was unlocked but still in Stock Nougat (7.0?). Got that from OTA in Brazil.
- I tried to update to LineageOS 7 via TWRP. After a full wipe (everything, system, data, card, cache etc) I installed the new ROM. Turned on, bootlooped forever.
- Searching around I found out that there was no modem in the Nougat roms and for some reason I needed to flash a Marshmallow modem for my region to make that work (I think there is no Nougat modems around or something).
- I found a LA_DS modem for 6.0, flashed that using TWRP, still bootloop. Tried other roms using TWRP, still bootloop.
- I then downloaded a full stock old 6.0 firmware to go back to stock but the phone wouldn't accept some files ("preflash validation failed").
- Searched around and found out that you can't downgrade a bootloader from Moto.
- Using fastboot, I flashed the files the phone was willing to accept and it finally booted the 6.0 Marshmallow stock rom, but with no networking (radio/modem/baseband/IMEI missing).
- Flashed the 6.0 modem for my region again and everything worked. Connected on WiFi, dual sim cards detected etc.
- I started to install every update the phone showed to try to update it back to latest MM version.
- The three first updates went ok, the fourth turned off the phone to never turn on again.
Looks like there is no way out of this. My phone is pretty old and MotoCare in Brazil will charge a lung and a half for repair.
Click to expand...
Click to collapse
Pretty similar situation on my part. I downgraded back to 6.0 and when it tried to take the December update I ended up with the same thing as you. I ended up getting a replacement from Moto for under 100 dollars which was worth it rather than trying to find a solution that doesn't exist.

Installing new os in zuk z1

Hi... I have updated my phone to LineageOS successfully but I lost fingerprint option. I'm getting system update options in Settings but when I tried to update the stuck in bootloop and I was able to get it to work by entering some codes in this forum... First, I have unlocked the bootloader and rooted my phone and installed TWRP and flashed LineageOS. All went good but I lost the fingerprint option and auto rotate and some features are not working properly. If I want to update it again to the latest version, do I have to unlock bootloader, root again? Please help... My phone was good before I updated it
Kishorechittem said:
Hi... I have updated my phone os successfully but I lost fingerprint option. My concern is how to update os again as I have already unlocked bootloader and rooted my phone
Click to expand...
Click to collapse
Which os did you update and which rom was it before. Please tell exact versions and if you have the regarding links.
Normally that happens without the right firmware like marshmallow before installing a nougat rom. But let's see what's the problem of yours.

Essential PH-1 downgrade

Hello yall!
So I am at a complete loss on how to fix the issues with my Essential device.
So I decided to post here in as much detail as I can and hopefully receive some answers.
I purchased my phone used from eBay about a month ago.
According to the listing it was factory unlocked.
I have AT&T prepaid.
Everything was running smoothly for about a week until I receive the notification for the Android Pie OTA.
(At this time my bootloader was not yet unlocked nor was I rooted).
Again everything was fine UNTIL I installed the security patch update.
As soon as I installed and rebooted my sim read as invalid.
I rebooted, tried to mess with network settings, factory reset, etc.
Turning to Google, I realize this is a common issue with the Sprint variant of this device (of course my luck would be for me to unknowingly purchase the Sprint variant not knowing there was any issues) and the pie update.
The main fix for this issue would be of course to downgrade back to Android 8.
Here's my issues...
I unlock my bootloader.
Install the Android 8 firmware from the official Essential site. (made sure to install the one for Sprint variant).
Flash.
The touch screen is not functional. At all.
Flash back to Android Pie and install TWRP
Flash Android 8 custom ROM.
Touch screen still not functional.
So I'm back on Android Pie and touch screen is working, but sim is still invalid.
How are other essential users successful in downgrading the software?
HELP.
stephxo said:
Hello yall!
So I am at a complete loss on how to fix the issues with my Essential device.
So I decided to post here in as much detail as I can and hopefully receive some answers.
I purchased my phone used from eBay about a month ago.
According to the listing it was factory unlocked.
I have AT&T prepaid.
Everything was running smoothly for about a week until I receive the notification for the Android Pie OTA.
(At this time my bootloader was not yet unlocked nor was I rooted).
Again everything was fine UNTIL I installed the security patch update.
As soon as I installed and rebooted my sim read as invalid.
I rebooted, tried to mess with network settings, factory reset, etc.
Turning to Google, I realize this is a common issue with the Sprint variant of this device (of course my luck would be for me to unknowingly purchase the Sprint variant not knowing there was any issues) and the pie update.
The main fix for this issue would be of course to downgrade back to Android 8.
Here's my issues...
I unlock my bootloader.
Install the Android 8 firmware from the official Essential site. (made sure to install the one for Sprint variant).
Flash.
The touch screen is not functional. At all.
Flash back to Android Pie and install TWRP
Flash Android 8 custom ROM.
Touch screen still not functional.
So I'm back on Android Pie and touch screen is working, but sim is still invalid.
How are other essential users successful in downgrading the software?
HELP.
Click to expand...
Click to collapse
Go to the guide section and read the post that says uicc unlock there is a solution outlined.just follow it and your phone will be back in service
stephxo said:
Hello yall!
So I am at a complete loss on how to fix the issues with my Essential device.
So I decided to post here in as much detail as I can and hopefully receive some answers.
I purchased my phone used from eBay about a month ago.
According to the listing it was factory unlocked.
I have AT&T prepaid.
Everything was running smoothly for about a week until I receive the notification for the Android Pie OTA.
(At this time my bootloader was not yet unlocked nor was I rooted).
Again everything was fine UNTIL I installed the security patch update.
As soon as I installed and rebooted my sim read as invalid.
I rebooted, tried to mess with network settings, factory reset, etc.
Turning to Google, I realize this is a common issue with the Sprint variant of this device (of course my luck would be for me to unknowingly purchase the Sprint variant not knowing there was any issues) and the pie update.
The main fix for this issue would be of course to downgrade back to Android 8.
Here's my issues...
I unlock my bootloader.
Install the Android 8 firmware from the official Essential site. (made sure to install the one for Sprint variant).
Flash.
The touch screen is not functional. At all.
Flash back to Android Pie and install TWRP
Flash Android 8 custom ROM.
Touch screen still not functional.
So I'm back on Android Pie and touch screen is working, but sim is still invalid.
How are other essential users successful in downgrading the software?
HELP.
Click to expand...
Click to collapse
Did you unlock your critical partitions along with the bootloader?
arjunv said:
Go to the guide section and read the post that says uicc unlock there is a solution outlined.just follow it and your phone will be back in service
Click to expand...
Click to collapse
Do you think you could link that post for me? I can't seem to find it.
I also don't see any uicc option on my debice. (Not sure or that matters though)
If it's Sprint you need to wait 50 days before you can unlock it. CDMA phones are a pain in the ass to unlock, always buy International if possible!
This thread has some information that might be useful:
https://forum.xda-developers.com/essential-phone/help/unlock-sprint-version-t3720727
Sent from my PH-1 using XDA Labs
SuperBrolySSJ said:
Did you unlock your critical partitions along with the bootloader?
Click to expand...
Click to collapse
This is required for the touch screen firmware to be flashed and OP needs to see this.

Caught in bootloop when reaching UI

I finally give up. I had lineage 15.1 running on the device and decided to upgrade to a pie based rom. So I flashed november firmware, rom etc. then I only had 3g. Now I decided maybe I need to flash latest december firmware so I flashed the 10.0.3 firmware zip and lost my sim card completely. I reflashed the november firmware. This made the device bootloop so I decided to flash stock november rom again and start all over. Now it's independent of the rom it's running it boots until the sim pin dialog, i can even press some numbers but it just reboots after a certain amount of time. Access to fastboot works fine so any idea how I could fix this would be greatly appreciated.
Looks like you got a corrupted EFS partition. If you have a TWRP backup for that, just restore. And if you don't, there is a thread in the Mi A1 forum about restoring EFS when downgrade from Pie.
Benjamin_L said:
I finally give up. I had lineage 15.1 running on the device and decided to upgrade to a pie based rom. So I flashed november firmware, rom etc. then I only had 3g. Now I decided maybe I need to flash latest december firmware so I flashed the 10.0.3 firmware zip and lost my sim card completely. I reflashed the november firmware. This made the device bootloop so I decided to flash stock november rom again and start all over. Now it's independent of the rom it's running it boots until the sim pin dialog, i can even press some numbers but it just reboots after a certain amount of time. Access to fastboot works fine so any idea how I could fix this would be greatly appreciated.
Click to expand...
Click to collapse
First of all try to disable SIM Pin Lock from another phone. It was a bug from previous releases.
Second: never downgrade from Pie because it will causes issues and potential corruption.
jack_21 said:
First of all try to disable SIM Pin Lock from another phone. It was a bug from previous releases.
Second: never downgrade from Pie because it will causes issues and potential corruption.
Click to expand...
Click to collapse
But is downgrading from a custom rom comparable? And the firmware zips only have modems and bootloaders don't they? I am always struck how difficult the a1 is compared to my pixel 2
Benjamin_L said:
But is downgrading from a custom rom comparable?
Click to expand...
Click to collapse
Well, you upgraded to 10.0.3.0 so you must use only that Pie firmware for now

A2017G Oreo B.04 How to downgrade unrooted phone

Hello,
If there would be anybody who could help me in my problem I would be very grateful!
I was a happy nougat b.09 user when I tried to upgrade the phone to newest android, I installed Oreo B.04 and the phone got much slower, now tends to stutter on web browser and the battery life jumps like crazy. I went on for few weeks but now I can't take it anymore, I want to downgrade to Nougat, probably to B.12, but when I put either N-b.12 or N-FOTA-B10 to B12 from the download center thread into my sd card and rename it to update.zip, the phone still doesnt see it and I cant downgrade.
Is there a safe way to downgrade phone without root or risk of loosing data?
Btw. when I was upgrading the system few weeks ago i went form Nougat.b09 to nougat.b12 then oreo.b02, then unfortunately i downloaded nougatb.04 (mistaken it for oreo) and downgraded phone to it, repeated the process to get oreo.b04 - maybe this process made my phone slower? (but seems unlikely).
The accidental downgrade to N B04 is likely the big issue.
I would try flashing oreo B02, factory reset then flash the downgrade version of Nougat B12, not the regular one but this may actually be a case of needing an ADB connection or similar to reflash it with correct partitioning so I will defer to more experienced modders on this.
If you are on B04 Oreo right now, download the B12 package from a official ZTE source (ZTE Australia has the link for it). Same thing, rename to update.zip and put it in root for SD. If phone still doesn't detect, boot to recovery (power+volume up button), select the wipe/erase all data option first, select yes. After that, select Apply update from SD card then select the update.zip. package. Probably do another data and cache wipe just in case after its installed

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