Database Users

Chinese model cellular not working

Hi All,
I've flashed @DrakenFX back-to-stock zip's for U variant on my Chinese one, both BootStack and StockSystem zips.
happy to confirm that everything works except the cellular network basically making this a tablet
Trying to go back to Chinese stock, the boot stack for that model has no mirrors on the download page (ZTE_A2017V1.0.0B10_BootStack_by_DrakenFX.zip)
would appreciate if anyone has the file and can re-upload it. Till then I'm stuck with absolutely no phone :crying:
Another option I'm willing to experiment with is to flash the modem so it will work nicely with the U-everything-else.
If anyone has reason to believe this will work and has the modem binary I'll go for it.
Having the U variant supported bands is a-OK by me.
I would've commented on the dev thread but as I'm a new user I'm still not allowed to

Here : ZTE_A2017V1.0.0B10_BootStack_by_DrakenFX.zip , just FYI next time you try to use a different variant Rom, you just need System.img & Boot.img (Stock System zip in this case using my files) , YOU DON'T need other variants Bootstack

TgSn said:
Hi All,
I've flashed @DrakenFX back-to-stock zip's for U variant on my Chinese one, both BootStack and StockSystem zips.
happy to confirm that everything works except the cellular network basically making this a tablet
Trying to go back to Chinese stock, the boot stack for that model has no mirrors on the download page (ZTE_A2017V1.0.0B10_BootStack_by_DrakenFX.zip)
would appreciate if anyone has the file and can re-upload it. Till then I'm stuck with absolutely no phone :crying:
Another option I'm willing to experiment with is to flash the modem so it will work nicely with the U-everything-else.
If anyone has reason to believe this will work and has the modem binary I'll go for it.
Having the U variant supported bands is a-OK by me.
I would've commented on the dev thread but as I'm a new user I'm still not allowed to
Click to expand...
Click to collapse
Hi! I have the exact same problem - no carrier signal after I flashed B29 US ROM on my chinese Axon 7 although the rest of the phone works fine - could you please please please tell me if you got it working and how??
Best Wishes

Hi there.. I read somewhere that it's possible to flash the global ROM on the US model and unlock the 866mbps WiFi speed (2x2 mimo).. Is this actually possible? If so, is it possible to flash just the radio on Lineage OS and get the same effect?

@TgSn
Did ur problem solved if not, then may b i could help you
Waiting for your reply

Volte Problem

I recently flash aicp rom for that I need to flash android n modem so I flash that also. For some reason I retrieve back to stock rom using twrp backup but now volte is not working here is some screen shots in attachment

In my experience, most of the CM based ROMS will have issues with VoLTE.

I am experience in stock rom also

That's not right. VoLTE works fine on stock. Of course, your provider needs to provide that service, otherwise that Enhanced LTE switch does not appear in the menu.

thats not prived by provider ..
SoNic67 said:
That's not right. VoLTE works fine on stock. Of course, your provider needs to provide that service, otherwise that Enhanced LTE switch does not appear in the menu.
Click to expand...
Click to collapse
am also face the above problem .. still have and searching for the fix .. many time flashed the stock again again .. no use .. any one fixed this problem but the r not ready to tell the solution .. .. waitting for fix .. if any one fixed pls give the fix instructon thanks in advance

Use The Fastboot Method To Flash All The Modem Files And Override Previous Ones That are Messed Up That Should Solve The Issue for You afaik and You didn't mentioned which Build of AICP were You Using ?

Baseband Collection/ Switching Guide

I really think there should be a thread on XDA with tested methods to switch baseband as a lot of people face trouble with GPS etc on custom ROMs. Ideally we should be having a collection of TWRP flashable zips instead of having to install stock firmware via tools like Miflash and then doing everything from the beginning.
This zip from Davideavinavil is TWRP flashable and it works perfectly for me. It doesn't improve things drastically from stock Marshmallow Indian ZUI baseband but would be great for if your GPS is not working or something.

To get the baseband from latest Indian ZUI Nougat Beta follow these instructions from zukfans by Magz Heaven. Tested on my own phone which previously had the above Davideavinavil zip flashed and is now on M8996FAAAANAZM-1.76387.1.92759.1. I wiped everything TWRP then flashed this in fastboot and then went back into recovery and flashed ROM + GApps. If you want to run this in Linux open the bat file as text and use the same fastboot commands with those files in your pwd.

1. Will bootloader be locked again after flashing baseband?
2. Do I have to flash ROM after flashing baseband?
3. Does bluetooth connectivity depend on baseband?
Thx

edimonoarfa said:
1. Will bootloader be locked again after flashing baseband?
2. Do I have to flash ROM after flashing baseband?
3. Does bluetooth connectivity depend on baseband?
Thx
Click to expand...
Click to collapse
I also would like to know this... Also does it matter if my phone was from China rather than India for the baseband? Someone please help with these answers
__ganeshanand said:
To get the baseband from latest Indian ZUI Nougat Beta follow these instructions from zukfans by Magz Heaven. Tested on my own phone which previously had the above Davideavinavil zip flashed and is now on M8996FAAAANAZM-1.76387.1.92759.1. I wiped everything TWRP then flashed this in fastboot and then went back into recovery and flashed ROM + GApps. If you want to run this in Linux open the bat file as text and use the same fastboot commands with those files in your pwd.
Click to expand...
Click to collapse
Any idea man?

1qazwsx4 said:
I also would like to know this... Also does it matter if my phone was from China rather than India for the baseband? Someone please help with these answers
Click to expand...
Click to collapse
1. Yes its possible that your bootloader gets locked after flashing. If you do it wrong and doesnt check it after first reboot you can brick your device.
2. No you dont.
3. Someone said when you only flash the NON-HELOS.bin file you can get problems with bluetooth. If its right I dont know.

Danoz88 said:
1. Yes its possible that your bootloader gets locked after flashing. If you do it wrong and doesnt check it after first reboot you can brick your device.
2. No you dont.
3. Someone said when you only flash the NON-HELOS.bin file you can get problems with bluetooth. If its right I dont know.
Click to expand...
Click to collapse
Thanks for your response. Only reason i asked about bluetooth is because only ONE custom rom works for me bluetooth wise. I'm unable to connect to my cars headunit with any rom except resurrection rom. Would flashing a modem help this? my modem is 9-00026-M8996FAAAANAZM-1.63821.1

1qazwsx4 said:
Thanks for your response. Only reason i asked about bluetooth is because only ONE custom rom works for me bluetooth wise. I'm unable to connect to my cars headunit with any rom except resurrection rom. Would flashing a modem help this? my modem is 9-00026-M8996FAAAANAZM-1.63821.1
Click to expand...
Click to collapse
Flashing custom roms shouldnt change the baseband. Does connecting work on rr with this baseband? Do you have problems with other bluetooth devices except your car?

Danoz88 said:
Flashing custom roms shouldnt change the baseband. Does connecting work on rr with this baseband? Do you have problems with other bluetooth devices except your car?
Click to expand...
Click to collapse
Sorry I probably didn't explain that the best. Flashing ROMs doesn't change my baseband but I'm wondering if changing my baseband will fix my Bluetooth problems. Yes RR works with my current baseband and my Bluetooth works with every device I've tried, on flashing to a different ROM none have worked sadly. I've tried to ask around if other people have issues but they all say their BT is working as it should haha

__ganeshanand said:
I really think there should be a thread on XDA with tested methods to switch baseband as a lot of people face trouble with GPS etc on custom ROMs. Ideally we should be having a collection of TWRP flashable zips instead of having to install stock firmware via tools like Miflash and then doing everything from the beginning.
This zip from Davideavinavil is TWRP flashable and it works perfectly for me. It doesn't improve things drastically from stock Marshmallow Indian ZUI baseband but would be great for if your GPS is not working or something.
Click to expand...
Click to collapse
I flashed this zip onto my z2 plus and the phone has stopped completely. Its not booting nor am i able to go to recovery.
It flashes ZUK message and then goes silent completely.
Have i bricked the phone? Can i recover it?
Thanks

Will this baseband work for the UK? Sorry if this a silly question

ramadurair said:
I flashed this zip onto my z2 plus and the phone has stopped completely. Its not booting nor am i able to go to recovery.
It flashes ZUK message and then goes silent completely.
Have i bricked the phone? Can i recover it?
Thanks
Click to expand...
Click to collapse
same here. damit

Lenovo Z2 Plus/ZUK Z2 Plus Baseband Update Guide(Keeping Bootloader Unlocked)

Q. Whats Baseband?
Baseband in laymans terms refers to the radio drivers or blobs of the device.
Many users have complained of their bootloader getting relocked after updating their baseband through a zip file through TWRP or even through fastboot
This guide is for updating the baseband through fastboot WITHOUT RELOCKING THE BOOTLOADER
Using this Method Wont Touch Your Bootloader Keeping it AS IT IS (In the same state as without flashing this baseband)
Many a times after updating baseband or restoring firmware backup through TWRP we cant hear sound or the reciever cant hear us during calls OR sometimes in your custom ROM or sometimes even in latest ZUI you cant get VOLTE working despite all correct APN settings
If you face this problem then updating your Baseband will Solve the Problem Most Of the Times
DO NOT USE THIS ON MARSHMALLOW STOCK ROM OR MARSHMALLOW BASED CUSTOM ROMS IT WILL CAUSE PROBLEMS
USE THIS ON NOUGAT STOCK ROM OR NOUGAT/OREO BASED CUSTOM ROMS
CAN BE USED WITH LOCKED BOOTLOADER ON STOCK ROMS
If TWRP is installed then take a backup of your efs partitiom
Using This Tool Will update the Baseband to M8996FAAAANAZM-1.76387.1.92759.1 (Latest Nougat Baseband)
1.First download the tool from this link https://drive.google.com/file/d/0B2CgYqnPbCh_Q2N0Vmd1d00ySFk/view
2.Download and unpack archive
3.Load the phone into fastboot mode.
4.Connect to PC.
5.In the folder with the unpacked package: Run cmd and then flash_radios.bat - follow instruction on screen.
6.Reboot.
For Installation without PC flash this zip file by davide which i have edited so that it doesnt lock the bootloader or change the splash image, using custom recovery.
https://drive.google.com/file/d/1mHdf2kc0ARpRO6kxAKiI3dotAVY0TJdM/view?usp=drivesdk
For Signal Fluctuations On Treble Oreo Roms (eg.Jio) Flash the 3.5 Baseband From This Thread
https://forum.xda-developers.com/le...irmwarebaseband-twrp-flashable-t3776254/page1
If Updating Baseband Breaks Your Volte You Need To Restore Your TWRP Efs Partition Backup Taken Earlier Look Into This Guide If Restoring Doesnt Help
https://forum.xda-developers.com/lenovo-zuk-z2/how-to/volte-problems-custom-roms-t3744291
Hit Thanks If You Liked It

Tried this method 3 times on different roms bases on oreo and naugat but same result got updated baseband but lost volte....
If u have any other method then please tell me....
Thanks in advance

Pramodkjan said:
Tried this method 3 times on different roms bases on oreo and naugat but same result got updated baseband but lost volte....
If u have any other method then please tell me....
Thanks in advance
Click to expand...
Click to collapse
I too lost my volte.
After flashing pixel experience 26/11 build i got back my volte, i can call but still can't hear voice aur can't send voice. My mic is working fine.
Possible solution plz.

dashingdave said:
I too lost my volte.
After flashing pixel experience 26/11 build i got back my volte, i can call but still can't hear voice aur can't send voice. My mic is working fine.
Possible solution plz.
Click to expand...
Click to collapse
Pramodkjan said:
Tried this method 3 times on different roms bases on oreo and naugat but same result got updated baseband but lost volte....
If u have any other method then please tell me....
Thanks in advance
Click to expand...
Click to collapse
Did you try clean flashing? Back up data before you do that.

Ritik17 said:
Did you try clean flashing? Back up data before you do that.
Click to expand...
Click to collapse
Updated but after a lot of flashing
1st made a full wipe except internal
2nd flashed baseband and after reboot volte again gone
3rd flashed deodexed stock zui and checked volte
4th flashed AEX 5.0
Oh god.....
Finally i am with updated baseband without losing my data
Thank u

Can I do this without reflash rom (aex 5)? Just reboot phone and that's it?
Dont using volte, no problem if lose it.

IgorIgor84 said:
Can I do this without reflash rom (aex 5)? Just reboot phone and that's it?
Dont using volte, no problem if lose it.
Click to expand...
Click to collapse
If u don't need volte than u can dirty flash baseband on any rom naugat or oreo.
But i think volte is gone because baseband is being flashed with some errors. So it can cause problems like signal fluctuations and wifi instability..

For those who getting volte and calling voice bugs...
Flash deodex zui 2.5 indian ..
How i solve my prob
Basically i try oxygen os marshmallow based rom(which degrade my baseband to a mm one) and then i restore my naugat twrp backup....then the voice bug happen.....
Then i flash the latest indian baseband from zuk fans forum....on my custom naugat rom(viper os)
After flashing voice bugs gone...but my volte stops working....
Then i flash deodex stock zui 2.5 indian and enable volte(volte works at this stage) and then flash my custom naugat again ...and everything is fine
SO THE STEPS ARE
1..Flash baseband ..then check if everything works fine or not(basically check ur volte and voice call)
If not then follow step 2
2..Flash stock zui2.5 indian....after zui flashing check everything will be working great ..(don't forget to enable volte in stock)
3...Now its upon u whether to flah custom or not
..................ENJOY.................
NOTE: MY DATA IS SAFE...BY ABOVE STEPS U WILL NOT LOOSE UR DATA
M giving some reference link down below hope i helped u
Zui( flash indian version for volte)
https://forum.xda-developers.com/le...t/deodexed-z2-plus-nougat-2-5-334-st-t3594483
Indian baseband
https://zukfans.eu/community/thread...nd-collection-versions.4162/page-7#post-44007

Pramodkjan said:
Updated but after a lot of flashing
1st made a full wipe except internal
2nd flashed baseband and after reboot volte again gone
3rd flashed deodexed stock zui and checked volte
4th flashed AEX 5.0
Oh god.....
Finally i am with updated baseband without losing my data
Thank u
Click to expand...
Click to collapse
Which stock 2.5 or 3.1

Pramodkjan said:
Updated but after a lot of flashing
1st made a full wipe except internal
2nd flashed baseband and after reboot volte again gone
3rd flashed deodexed stock zui and checked volte
4th flashed AEX 5.0
Oh god.....
Finally i am with updated baseband without losing my data
Thank u
Click to expand...
Click to collapse
If you already flashed the baseband then you don't need to flash it again, if volte doesn't work for you then you can flash baseband and clear modemst1 and 2 yourself and clean flash rom/gapps/magisk.

dashingdave said:
Which stock 2.5 or 3.1
Click to expand...
Click to collapse
3.1 china

Pramodkjan said:
If u don't need volte than u can dirty flash baseband on any rom naugat or oreo.
But i think volte is gone because baseband is being flashed with some errors. So it can cause problems like signal fluctuations and wifi instability..
Click to expand...
Click to collapse
Thanx, I'll do like you said.
I occasionally loose signal bars, then I can't receive and send calls. It's just for few seconds, but it's still annoying coz I have too much calls with partners on my work.

Works like charm!
I'm running AOSP Extended 5.0 Latest Build by @davidevinavil . I just downloaded, unpacked archive, rebooted phone in fastboot mode, connected to my PC (USB 2.0), and ran .bat file as administrator, disconnected phone and restart. Everything is working. Thank you dev for this guide! :good: PS. Not a Jio user so no idea if VoLTE works. WiFi, 4G, Calls work flawless.
---------- Post added at 03:40 AM ---------- Previous post was at 03:37 AM ----------
ninad7478 said:
I'm running AOSP Extended 5.0 Latest Build by @davidevinavil . I just downloaded, unpacked archive, rebooted phone in fastboot mode, connected to my PC (USB 2.0), and ran .bat file as administrator, disconnected phone and restart. Everything is working. Thank you dev for this guide! :good: PS. Not a Jio user so no idea if VoLTE works. WiFi, 4G, Calls work flawless.
Click to expand...
Click to collapse
UPDATE. I'm using Vodafone (Mumbai Suburbs) and after updating baseband, I'm getting faster webpage loading speeds than before.

This can be flashed on locked bootloader of nougat stock roms?

For Changing Baseband Without PC Flash this zip by davide which I have edited so that it wont relock the bootloader or change the splash image. Baseband version 2.0
https://drive.google.com/file/d/1mHdf2kc0ARpRO6kxAKiI3dotAVY0TJdM/view?usp=drivesdk

calling issues: receiver cant able to hear me properly
First i flashed stock (nougat) ZUI_2.5.104_ST (Indian) volte was working fine calling was perfect on both sims.
Then i flashed aex 4.6 i checked the baseband it was version 1.7 (previously it was 1.6).
Volte is not showing then i have to manually add the apn then volte was there.
But sim1 voice clarity is not perfect receiver cant able to hear me....sim2 working loud & clear
Please suggest to me some method to resolve this

Ritik17 said:
If you already flashed the baseband then you don't need to flash it again, if volte doesn't work for you then you can flash baseband and clear modemst1 and 2 yourself and clean flash rom/gapps/magisk.
Click to expand...
Click to collapse
how to clear modemst 1& 2 ?

vatstarun18 said:
how to clear modemst 1& 2 ?
Click to expand...
Click to collapse
Code:
fastboot erase modemst1
fastboot erase modemst2

Ritik17 said:
Code:
fastboot erase modemst1
fastboot erase modemst2
Click to expand...
Click to collapse
thanks for the reply
Which was the latest baseband according to indian zui....mine is showing in custom rom M8996FAAAANAZM-1.76387.1.92759.1
i flashed the last indian zui version 2.5.104_ST from that i have this baseband...but call quality in sim1 is worse
i am on aex 4.6

vatstarun18 said:
thanks for the reply
Which was the latest baseband according to indian zui....mine is showing in custom rom M8996FAAAANAZM-1.76387.1.92759.1
i flashed the last indian zui version 2.5.104_ST from that i have this baseband...but call quality in sim1 is worse
i am on aex 4.6
Click to expand...
Click to collapse
That is the latest Indian baseband, don't know about quality it's decent for me.

IMEI problem on october patch oreo rom (stock moto)

Hey guys, I tried flashing the stock moto oreo rom (october patch) through 1. flashing via fastboot and 2. twrp flashable rom.
Both methods worked but I lost my IMEI, regardless of which method I flashed the rom with.
I had made two EFS & Persist backups (one from resurrection remix rom and one from a twrp nougat june patch rom) and tried to restore them after flashing the moto oreo rom, but no success.
Can anyone help me with this? I really want to use the stock oreo rom!

Please help guys!

roydhritiman said:
Hey guys, I tried flashing the stock moto oreo rom (october patch) through 1. flashing via fastboot and 2. twrp flashable rom.
Both methods worked but I lost my IMEI, regardless of which method I flashed the rom with.
I had made two EFS & Persist backups (one from resurrection remix rom and one from a twrp nougat june patch rom) and tried to restore them after flashing the moto oreo rom, but no success.
Can anyone help me with this? I really want to use the stock oreo rom!
Click to expand...
Click to collapse
Do a stock ROM flash using fastboot method, without "erase modest1" and "erase modest2" codes. It has solved my IMEI problem and it may solve yours also....

riyan65 said:
Do a stock ROM flash using fastboot method, without "erase modest1" and "erase modest2" codes. It has solved my IMEI problem and it may solve yours also....
Click to expand...
Click to collapse
I shall try!

riyan65 said:
Do a stock ROM flash using fastboot method, without "erase modest1" and "erase modest2" codes. It has solved my IMEI problem and it may solve yours also....
Click to expand...
Click to collapse
i tried reflashing using fastboot method without the modest1 and modest2 codes and i am getting IMEI but no signal! this is very weird! what to do?
attaching links to screenshots -
all sims enabled - https://drive.google.com/open?id=1oyiCZIvt2LWtcp3ZKWzC_XEjpngdw8zR
IMEI but no signal - https://drive.google.com/open?id=1M_rbjKFXJ30H9DrnuIHDjdoO2OwPiRbL
help!

roydhritiman said:
i tried reflashing using fastboot method without the modest1 and modest2 codes and i am getting IMEI but no signal! this is very weird! what to do?
attaching links to screenshots -
all sims enabled - https://drive.google.com/open?id=1oyiCZIvt2LWtcp3ZKWzC_XEjpngdw8zR
IMEI but no signal - https://drive.google.com/open?id=1M_rbjKFXJ30H9DrnuIHDjdoO2OwPiRbL
help!
Click to expand...
Click to collapse
You probably have a corrupted persist partition. If you flash the soak test 1 firmware (link is in the TWRP flashable Oreo thread) you may get back your signal.

NZedPred said:
You probably have a corrupted persist partition. If you flash the soak test 1 firmware (link is in the TWRP flashable Oreo thread) you may get back your signal.
Click to expand...
Click to collapse
Could you provide a direct link to the ROM you're referring to? I tried searching for it in your thread but couldn't understand which one to download.

roydhritiman said:
Could you provide a direct link to the ROM you're referring to? I tried searching for it in your thread but couldn't understand which one to download.
Click to expand...
Click to collapse
Links below. (Sorry - they are buried in the FAQ post - "On soak test 2 or later, I have my IMEI but no signal. What can I do?")
Android File Host - oreo-soak1-firmware.zip
Dropbox - oreo-soak1-firmware.zip

NZedPred said:
Links below. (Sorry - they are buried in the FAQ post - "On soak test 2 or later, I have my IMEI but no signal. What can I do?")
Android File Host - oreo-soak1-firmware.zip
Dropbox - oreo-soak1-firmware.zip
Click to expand...
Click to collapse
this is a small file..so should i flash this via twrp? im on the october patch right now. so should i dirty flash or clean flash it over my current rom?

roydhritiman said:
this is a small file..so should i flash this via twrp? im on the october patch right now. so should i dirty flash or clean flash it over my current rom?
Click to expand...
Click to collapse
yes that's to be flashed with TWRP. Just dirty flash it over the top of your current rom.
All it is is a few partitions from stock oreo - modem, dsp, fsg. These are used in some way for connectivity, so hopefully they fix things up.

NZedPred said:
yes that's to be flashed with TWRP. Just dirty flash it over the top of your current rom.
All it is is a few partitions from stock oreo - modem, dsp, fsg. These are used in some way for connectivity, so hopefully they fix things up.
Click to expand...
Click to collapse
i flashed it over the october flash and damn it works! thanks man!

NZedPred said:
yes that's to be flashed with TWRP. Just dirty flash it over the top of your current rom.
All it is is a few partitions from stock oreo - modem, dsp, fsg. These are used in some way for connectivity, so hopefully they fix things up.
Click to expand...
Click to collapse
Hey just one more thing to add. After flashing the ROM you provided, the audio quality is really bad on music streaming apps except for YouTube. How do I fix this?

roydhritiman said:
Hey just one more thing to add. After flashing the ROM you provided, the audio quality is really bad on music streaming apps except for YouTube. How do I fix this?
Click to expand...
Click to collapse
No idea. Post in the stock Oreo thread and ask if others are seeing this, especially those that need to use the soak test 1 firmware

NZedPred said:
No idea. Post in the stock Oreo thread and ask if others are seeing this, especially those that need to use the soak test 1 firmware
Click to expand...
Click to collapse
Link to stock Oreo thread please?

https://forum.xda-developers.com/g5...o-twrp-flashable-stock-builds-coming-t3830482

roydhritiman said:
Hey guys, I tried flashing the stock moto oreo rom (october patch) through 1. flashing via fastboot and 2. twrp flashable rom.
Both methods worked but I lost my IMEI, regardless of which method I flashed the rom with.
I had made two EFS & Persist backups (one from resurrection remix rom and one from a twrp nougat june patch rom) and tried to restore them after flashing the moto oreo rom, but no success.
Can anyone help me with this? I really want to use the stock oreo rom!
Click to expand...
Click to collapse
Hi, Look, I have a problem with my Moto G5 plus cell phone. I do not have a mobile signal, according to what I have seen and seen on my cell phone, it is because it does not detect any EFS / IMEI partition, I think it would be useful for me to help you with your backup. EFS for me to resture it to see if it works, do not worry about the IMEI I have the original mine please help me with that I would thank you ..... or anyone who can help me ....

Neider Mercado said:
Hi, Look, I have a problem with my Moto G5 plus cell phone. I do not have a mobile signal, according to what I have seen and seen on my cell phone, it is because it does not detect any EFS / IMEI partition, I think it would be useful for me to help you with your backup. EFS for me to resture it to see if it works, do not worry about the IMEI I have the original mine please help me with that I would thank you ..... or anyone who can help me ....
Click to expand...
Click to collapse
Have you ever flashed someone else's persist file?
If yes you're most probably screwed. All this things like persist (incl. IMEI) and efs are unique to every device. You don't write which android version you're on, maybe it could help you what @NZedPred posted above, flashing soak test Oreo 1 via TWRP.
Read the last posts.

Wolfcity said:
Have you ever flashed someone else's persist file?
If yes you're most probably screwed. All this things like persist (incl. IMEI) and efs are unique to every device. You don't write which android version you're on, maybe it could help you what @NZedPred posted above, flashing soak test Oreo 1 via TWRP.
Read the last posts.
Click to expand...
Click to collapse
Thanks for your reply ... I have not tried to update another EFS folder from another device ... I currently have the version of Android 8.0 ROM Google experience, but it's the same ... the IMEI comes out but no signal ...
and the file to flash of TWRP does not work ... I tried to make a backup of the EFS folder with an application and it says that "SORRY, WE CAN NOT DETECT ANY EFS/IMEI PARTITION ON YOU DEVICE"
THANKS.