yashsingh1/xdaforums huggingface dataset:
[Xiaomi Mi A1 Guides, News, & Discussion] sainth4tred:
[MENTION=9047615]Userbaban[/MENTION] [MENTION=7767486]kenzyyy[/MENTION] how did you get your IMEI back?
[Xiaomi Mi A1 Guides, News, & Discussion] taran181:
will restoring efs folder will affect my own imei number? what there's in efs folder please any reply?

---------- Post added at 05:45 PM ---------- Previous post was at 05:38 PM ----------

will restoring efs folder will affect my own imei number? what there's in efs folder please any reply?
[Xiaomi Mi A1 Guides, News, & Discussion] martinlaizg:
This still on boot loop

I do this steps and still on bootloop.

Phone restarts after 30 seconds
[Xiaomi Mi A1 Guides, News, & Discussion] kenzyyy:
Just flash those files in TWRP efs backup, and after that flash 8.1 november. First I didn't have IMEI nor signal but after restoring efs and flashing 8.1 November update everything is back to normal.

Good luck!!!!!!
[Xiaomi Mi A1 Guides, News, & Discussion] taran181:
restoring someone else's efs won't affect our own imei number?
[Xiaomi Mi A1 Guides, News, & Discussion] kenzyyy:
By following that tutorial I've got my IMEI back. It matches with the one on the Box of the phone
[Xiaomi Mi A1 Guides, News, & Discussion] taran181:
ok, thanks will try it, but usually efs backup's our imei right?
[Xiaomi Mi A1 Guides, News, & Discussion] kenzyyy:
I don't know.. I just did what tutorial told and I've successfuly downgraded from stock beta pie to 8.1 november
[Xiaomi Mi A1 Guides, News, & Discussion] taran181:
ok, thanks bro for the info
[Xiaomi Mi A1 Guides, News, & Discussion] Ashalby:
Did it work for u ?
[Xiaomi Mi A1 Guides, News, & Discussion] taran181:
i didn't tried yet,,, as i have posted same question in q/a and waiting for the answer
[Xiaomi Mi A1 Guides, News, & Discussion] Ashalby:
I asked on some telegram groups and they confirm that it works so am gonna take the risk and try ... I feel like i am in jail with this anti rollback update
[Xiaomi Mi A1 Guides, News, & Discussion] taran181:
it will work i also think,, but i am worried about restoring someone's else efs folder? efs usually contains imei number and modem
[Xiaomi Mi A1 Guides, News, & Discussion] Ashalby:
Same here but we got no other solutions ... I will give it a try
[Xiaomi Mi A1 Guides, News, & Discussion] taran181:
ok.. tell me if it worked for you.... i also heard somewhere on youtube that mi is going to release stable version between 21-31 dec, so i waiting for the stable fastboot rom.
[Xiaomi Mi A1 Guides, News, & Discussion] Ashalby:
till now i got no errors during the process and i reached the last step but how to flash fastboot rom 9.8.0 at the last step and i dosen't contain images folder or any .bat files like the first rom in step 1 ? ... mi flash tool dosen't detect the file !!

---------- Post added at 06:16 PM ---------- Previous post was at 05:40 PM ----------

finally ... i am so happy and thankful for those who created this method and helped us ... it did work without any imei losing or signal losing everything is back to normal and i'm out of pie's jail
[Xiaomi Mi A1 Guides, News, & Discussion] debadri1995:
edit: sry, my mistake I was confused between march update & twrp file

"3. Flash Fastboot March Update" can anyone explain the procedure? how to flash that file?
[Xiaomi Mi A1 Guides, News, & Discussion] sainth4tred:
[MENTION=9304567]Ashalby[/MENTION] you followed the exact guide with exact files and your IMEI was your original?
[Xiaomi Mi A1 Guides, News, & Discussion] Ashalby:
Yes bro the same guide with the provided files and every thing works fine and i also flashed oreo miui rom and it works well....just take care about flashing options in miflash tool and don't lock ur bootloader
[Xiaomi Mi A1 Guides, News, & Discussion] GiantG:
Thank you very much

I hope you can make in the lottery, helped me a lot. Saved my mi a1 in brazil (since there is no authorized technical assistance here).
[Xiaomi Mi A1 Guides, News, & Discussion] phoenix.:
After unlocking bootloader when i flashed it started!!!!

After unlocking bootloader when i flashed 9.5 it started IMEI was there but no network !!!! so i thought to flash 9.6 then i got the bootloop issue!
[Xiaomi Mi A1 Guides, News, & Discussion] sainth4tred:
Did you guys get your IMEI back after flashing the March patch, or even after November?
[Xiaomi Mi A1 Guides, News, & Discussion] Laodeus:
If you come in belgium,

put a message here and i'll pay you a beer...

that's the less i can do to thank you ^^

It worked for me :)
[Xiaomi Mi A1 Guides, News, & Discussion] sainth4tred:
You also got IMEI back and signal and stuff?
[Xiaomi Mi A1 Guides, News, & Discussion] paadupaadu:
hi bro, i am facing network issue, after updating to pie my network towers are not showing even after fashing another rom the towers are still not comming please help me on this.
[Xiaomi Mi A1 Guides, News, & Discussion] Amanpreetsingh:
This process will wipe internal ??
[Xiaomi Mi A1 Guides, News, & Discussion] ibooth2004:
I managed to successfully downgrade to Oreo from Pie following this, I have both my original IMEIs and my original mac address. The only issue I ran in to is that after I restore the TWRP backup I have to reflash the march update not the November one. The November update kept getting stuck at Mi logo and rebooting. I flashed the march update after restoring the TWRP backup and everything worked fine, I then OTA updated to November security patch and it boots and works perfectly.
[Xiaomi Mi A1 Guides, News, & Discussion] ibooth2004:
I flashed the march patch, then used the EFS and boot backup in the OP, I then reflash the March patch again and my device booted up fine with the original IMEIs and Mac address intact. I was then able to update to the November patch via OTA.
[Xiaomi Mi A1 Guides, News, & Discussion] Arnav1104:
I did all of it it restored my mobile network...

But my Volte doesn't work properly..

Like call dosent connect, Frequent call drops

Please help i am now on the latest liquid remix rom
[Xiaomi Mi A1 Guides, News, & Discussion] Xaviers101:
This is only required in case of downgrading fr stock pie to stock oreo?
[Xiaomi Mi A1 Guides, News, & Discussion] ibooth2004:
Yes.
[Xiaomi Mi A1 Guides, News, & Discussion] alexisjkn:
help!

can i do it with the july parch?
[Xiaomi Mi A1 Guides, News, & Discussion] Daniel.meurer:
After flashing the november system fyle, I get stuck in the Android One Logo
[Xiaomi Mi A1 Guides, News, & Discussion] mity_dev:
This worked from me thank you very much . But i lost my imei in this process. [MENTION=9047615]Userbaban[/MENTION] how did you restore your imei what is the process you used can you link it please.
[Xiaomi Mi A1 Guides, News, & Discussion] tsrnb:
Unable to recover imei

Bro I'm unable to recover imei:crying::crying:. i tried everything to restore. i dont even have a backup. help me!!
[Xiaomi Mi A1 Guides, News, & Discussion] diegojassiel:
I did this:

I was in 9.0 official, i downgraded to 8.0 with january patch, when the phone booted the IMEI was ok but i dont had signal so i flashed by fastboot the 9.0 modem and i had signal again, then i updated via ota to the november patch, when the phone booted went to bootloop so i flashed again the 9.0 modem and now is working ok without problems.
[Xiaomi Mi A1 Guides, News, & Discussion] Custom rom 243:
Did it now will wait till it gets over
[Xiaomi Mi A1 Guides, News, & Discussion] AnktDagar:
9.0 modem ... Can u send link
[Xiaomi Mi A1 Guides, News, & Discussion] cyrrel:
Hi guys,

first of all - thanks for the tutorial, it worked for me!

What I just noticed is that in my slot 2, I currently should have 3g but only have 2g (settings to preferred network 4g/3g are ok).

Anyone else noticed that?
[Xiaomi Mi A1 Guides, News, & Discussion] Teguhperbawa:
Thank you, it works for me
[Xiaomi Mi A1 Guides, News, & Discussion] cyrrel:
no one with the same problem in slot 2?
[Xiaomi Mi A1 Guides, News, & Discussion] ccalixtro:
cant repair my imeis. came from pie 10.0.4, had to downgrade to nougat via edl, then to march, try the backup you share but imei stay in 0. any help?
[Xiaomi Mi A1 Guides, News, & Discussion] murtaza1326:
degrade to nougat on nougat use this tool

https://mydevfiles.com/download/write-dual-imei-tool/

write imei from this and you are good to go

p.s yesterday my phone hardbricked because of 10.0.4 firmware restored and got my imei all things working again

p.s in whole process my bootloader was unlocked
[Xiaomi Mi A1 Guides, News, & Discussion] kak4rot:
Thanks a lot, With this tutorial I have been able to bring to life my Mi A1, I have been able to fix the bootloop and install lineage 15.1, greetings from Spain! :good::good:
[Xiaomi Mi A1 Guides, News, & Discussion] Thomasony:
First off all I want to tell you, after years of using xda (from my cyanogenmod on xperia SP). I finally felt the need to register and to say thank you sir, you saved my phone and my nerves.

The problem:

I had updated to Pie and did TWRP because I wanted to make GPS Joystick system app, was going though options and messed something up. Than my sensor and my wifi stopped working, no matter how many time I reboot the phone still the same. In the end, I went fastboot - twrp, and I started changing between partitions, ended up with message that my system was destroyed.

What I tried:

After that I tried several images over MiFlasher, some did made my phone bootloop, others made my GSM radio go on and off all the time. I even tried LineageOS 15.1, that made my phone go black after the loading logo. At this time 6 hours of internet searches, tutorials, and about 20gb of different roms where used.

This solution:

I was affraid to put simcard to my phone again, though it will go crazy again with the GSM radio. When it displayed pin screen I tought it was gonna bootloop again. After it showed signal, oh man... My happiness...

One thing that I want to mention, with the recovery of files (boot, EFS). The video that you provided didn't help me, because I saw the folder in recovery, but not it's contents. The thing that I did was from original solution link that you worked on. This step:

9-go to restore in TWRP and chose the backup folder , restore *Boot* and *EFS* and swipe (if it doesn't show anything to restore go to TWRP>backup and copy *2018-12-06--15-41-27_PQ1A181205006* folder into *TWRP* folder "not to backup folder")

Might be usefull for other people that are facing the same issue. Sorry for the long replay, and my english if I made some mistakes (not my native). And sir, thank you again.
[Xiaomi Mi A1 Guides, News, & Discussion] lovelyjcp:
I lost my IMEI and network signal after flashing the March fastboot ROM. But thanks to this (https://xdaforums.com/mi-a1/how-to/guide-how-to-restore-imei-permanently-t3759190/page6) tutorial I was able to restore my IMEI and now my phone's working again.
[Xiaomi Mi A1 Guides, News, & Discussion] agentofchaoss:
i need help

i flashed january firmware over november firmware and then lost volte

after that in order to get it back i flashed someone else's efs and modem and boot

i lost my imei and signals

please help me

telegram@AgentOfChaoss
[Xiaomi Mi A1 Guides, News, & Discussion] yashaswee.exe:
After doing this procedure my IMIE number is gone. its showing 0(zero).
[Xiaomi Mi A1 Guides, News, & Discussion] yashaswee.exe:
where you found the qcn file?
[Xiaomi Mi A1 Guides, News, & Discussion] yashaswee.exe:
which process did you followed to get imei back??
[Xiaomi Mi A1 Guides, News, & Discussion] lovelyjcp:
Hi. I downloaded the qcn file I found here in XDA. I can edit it with your IMEIs so it would be less hassle for you. A little help. ?
[Xiaomi Mi A1 Guides, News, & Discussion] yashaswee.exe:
If you still have that qcn file can you upload it on google drive and share the link??

we just have to replace the hex code of mine imei number and save right?
[Xiaomi Mi A1 Guides, News, & Discussion] lovelyjcp:
Hi. You can check the qcn file in this link. Just browse through the comments.

https://xdaforums.com/mi-a1/how-to/guide-how-to-restore-imei-permanently-t3759190/page3
[Xiaomi Mi A1 Guides, News, & Discussion] n00b Learner:
Does downgrading to Oreo still allow for monthly security update?
[Xiaomi Mi A1 Guides, News, & Discussion] akashavel:
Hi guys I tried downgrade to 8 from 9 but I lost imei and mobile network was switching on and off. I followed how to procedure in discussion forum . But now I got my imei and mobile network back but placing calls after connected no sound in ear speaker and in loud speaker..I'm able not able attend any calls or place calls..no dial tones.. too but 4g is working fine .pls help to fix call issue.

---------- Post added at 07:31 AM ---------- Previous post was at 07:06 AM ----------

When flashing 968 in flash mode in miflash before flashing completed my phone got booted and went on boot loop..how to flash completely till end?

Then I flashed firmware 10 (not full rom) and got my imei and mobile networks but facing calling issue
[Xiaomi Mi A1 Guides, News, & Discussion] Nickinfinity:
restore nov & reboot, then flash dec & reboot and then jan anf reboot. Directly flashing jan over nov will break it.
[Xiaomi Mi A1 Guides, News, & Discussion] twister26:
this thread saved my mi a1, revived from death
[Xiaomi Mi A1 Guides, News, & Discussion] paul2099:
yikes, I lost my imei
[Xiaomi Mi A1 Guides, News, & Discussion] akashavel:
Flashed crdroid latest build and now everyting is working fine..but how to go noughat ?
[Xiaomi Mi A1 Guides, News, & Discussion] Damarborn:
I did the downgrade procedure PIE> OREO worked out, but the IMEI was reset, so my despair started. I read somewhere that updating to the PIE via ota the imei came back, I updated, however, only if the wifi was connected. I went back to pixel to see if it worked for the same thing. I followed the tutorial about the imei of typing the code in the phone. But the code did not work and soon the program did not work. I decided to redo the process back to 8.1 so now whenever I try to boot the November Patch, it loads and restarts to its initial screen to put the language, it takes a few seconds and restarts again. I've been waking up since 22hrs yesterday and I spent the whole of the night awake so far and I do not know what else to do. I've never had as much of a problem as this cell phone, so I've almost played it out: /
[Xiaomi Mi A1 Guides, News, & Discussion] voidtech:
Just note that in this step the directory might be prefixed with a date and time. something like 25-5-18-OBNSDKLFJSDLFKLF. The serial number that you are meant to rename the folder to is that last bit (i.e. OBNSDKLFJSDLFKLF).
[Xiaomi Mi A1 Guides, News, & Discussion] akashavel:
Restore efs as per procedure (step 6 to 8) and flash firmware 10 (not full ROM) and then install any pie ROM ( i flashed crdroid pie ROM) you will get back everything
[Xiaomi Mi A1 Guides, News, & Discussion] Str!der:
Help needed

Hi,

I too lost all the signals when i upgraded to STOCK pie (January) from STOCK Oreo (November).

So I downgraded and followed all the Steps shown in the OP, but still i had no signal.

I even upgraded to pie once again vide OTA hoping that i will get signal, but still i had no signal. Can you please explain me the steps in detail so that i get my signal back.

Note: I tried my sims in other mia1 on pie and they are working. I also tried other working sims on my mia1, but no signal.

Kindly help at the earliest. I am without a phone for the last one week.

In some other thread of Q&A : https://xdaforums.com/showpost.php?p=78745081&postcount=7

One user gave some alternative to the method stated in OP.

Now my understanding is as follows: ( I am on STOCK PIE with NO SIGNAL)

Follow Steps 1 to 7 as it is in the link.

Step 8. Go to RESTORE, choose BACKUP , restore EFS and swipe. (No need to restore BOOT.img)

ADDITION: Step 8a. Go back and Install TWRP Flashable zip of Oreo 8.1 November Update (V9.6.8.0.ODHMIFE)

Step 9. Now in TWRP, go to REBOOT and Click SYSTEM. (No need to click BOOTLOADER here)

I will have November Update 8.1 installed on my phone.

Now, which ROM should i flash through MIFLASH after all this (November 8.1 once again or Pie January update) to restore mobile signal?

Please reply.
[Xiaomi Mi A1 Guides, News, & Discussion] apple11:
Managed to downgrade from Jan patch android 9 to Nov Patch android 8.1,only thing different is MAC address!

Also gotten three signal bar bugs thought

But thanks still for making the tutorial!

EDIT:My phone suddenly lost 4G+ on my other carrier SIM card which is Singtel working fine previously before the upgrade to P.Downgrade and install MIUI ROM.Thought was MIUI problem but returning to stock I still have 4G instead of 4G+.
[Xiaomi Mi A1 Guides, News, & Discussion] KingCraft143:
Didn't know it would factory reset my phone. Wish I knew sooner.
[Xiaomi Mi A1 Guides, News, & Discussion] Sztreho:
Dowgrade is working fine.

The Android 9 is suck.

8.x.. is fine

Thanks for the uploading
[Xiaomi Mi A1 Guides, News, & Discussion] friendfriend:
Is there a sure way to rollback 9.0->8.1 without IMEI problems?

Why somebody has IMEI issue and others not?
[Xiaomi Mi A1 Guides, News, & Discussion] Illuminatus_:
I tried to many times but it ends always without imei, i will try once again by flashing March update and then restore imei and upgrade to November update through the trwp recovery.
[Xiaomi Mi A1 Guides, News, & Discussion] friendfriend:
Give us some feedback did you succeed becouse this Pie is first class crap.
[Xiaomi Mi A1 Guides, News, & Discussion] Typhus_:
People,

The best, easy and flawless way, without any errors, to downgrade to Oreo is to use [MENTION=1844875]CosmicDan[/MENTION] tool.

The tool is HERE.

But, of course, you must have a backup made before upgrading to Pie.

I have one, but I've made a backup including all partitions....so the backup is almost 60GB.

Yesterday I've tried to recover the backup just to see what it would happen...everything went well.

Cheers!
[Xiaomi Mi A1 Guides, News, & Discussion] Illuminatus_:
I tried again but the result is still the same no imei no matter what i do or how i did it it dosent work for me.
[Xiaomi Mi A1 Guides, News, & Discussion] apple11:
Can anyone post a QCN file to re enable LTE CA aka 4G+ for those who had lost it after the downgrade

Which is the qcn file containing original value for LTE CA before the downgrade
[Xiaomi Mi A1 Guides, News, & Discussion] razorhape:
i can get signal up to 3G but my IMEI is still empty. what should i do?
[Xiaomi Mi A1 Guides, News, & Discussion] rexsmith9886:
Hey

I updated my phone to V10.0.4.0.PDHMIXM

Can I use this guide to downgrade without any IMEI Problem?

Please share the experience who have downgraded from V10.0.4.0.PDHMIXM to Oreo.
[Xiaomi Mi A1 Guides, News, & Discussion] mbiker:
I downgraded following this tutorial and I lost my Imei forewer, my MiA1 now is useless.
[Xiaomi Mi A1 Guides, News, & Discussion] rexsmith9886:
[MENTION=4196822]mbiker[/MENTION] your Mi A1 was on V10.0.4.0.PDHMIXM when you followed this guide?
[Xiaomi Mi A1 Guides, News, & Discussion] mbiker:
Yes it was, previously bootloader never unlocked and never rooted. Global ROM.
[Xiaomi Mi A1 Guides, News, & Discussion] Typhus_:
Have you guys tried THIS guide to recover your lost IMEI?
[Xiaomi Mi A1 Guides, News, & Discussion] mbiker:
Thank you, I tried this guide, and many many others, but nothing worked for me.
[Xiaomi Mi A1 Guides, News, & Discussion] 0xFast:
Ok, successfully get back the IMEI. But, only connect to 4G, can't use for calling and SMS. Already test with different SIM Card and still nothing.
[Xiaomi Mi A1 Guides, News, & Discussion] stelariusinfinitek:
Today I really wanted to get back to Nougat. I had enough of Pie and the awful stock Camera. I made some mistakes but in the end it was worth it. So I went from Pie January to the latest build of Nougat, flashed the build with MiFlash. The phone booted fine but I couldn't use the SIM or even unlock it, the IMEI was there tho. I updated to Oreo November 2018 through OTA, thinking that would fix the SIM. It didn't, phone went into bootloop after the update.

Even though I made a full backup before doing all of this and I knew I could flash Pie and recover the phone if I wanted, Pie was the last option in the list. I remembered this thread and I said : well, why not, let's try. I followed every step but after I flashed March update and restored your boot and EFS, I flashed March update again instead of November (heard some people say this and I tried it). It worked perfectly, IMEI is there, 4G works, everything. I am so happy to enjoy my phone again. I rooted it and thanks to this it can't update through OTA (disabled automatic updating in developer too). I just tried Night Sight a few moments ago and I can't believe how good Google Camera is. I'm never going back to Pie, I hated it so much. Nougat was my target but Oreo is fine too, not complaining.

Thank you again for your guide. You made a random person happy. Have a great day!
[Xiaomi Mi A1 Guides, News, & Discussion] 0xFast:
Is your HSDPA/3G connection is works? Can you make a call/SMS?
[Xiaomi Mi A1 Guides, News, & Discussion] stelariusinfinitek:
Yes, I tested calling and connectivity immediatly. Everything works. I compared the IMEI to the one on the box of the phone and they are the same.
[Xiaomi Mi A1 Guides, News, & Discussion] 0xFast:
OMG, I have crazy case. Thanks for your feedback.
[Xiaomi Mi A1 Guides, News, & Discussion] Bl4ckFrost:
Can I back from an 9.0 custom rom to 8.1 custom rom with flashing the 8.1 rom directly or I should follow the steps from the post?
[Xiaomi Mi A1 Guides, News, & Discussion] hycraig:
thanks for the guide all back up fine on 8.1 :) didn't work as it should have first time the twrp backup files from guide were not detected like the folder was empty, but after re-flashing again i tried again and it just worked which is strange.
[Xiaomi Mi A1 Guides, News, & Discussion] Dakile:
If there is someone from Serbia willing to explain this a little bit better please message me.
[Xiaomi Mi A1 Guides, News, & Discussion] Jt380p:
When you flashed Nougat rom, did you flash via fastboot or edl? (I want to follow your steps to ensure i dont screw up my imei)
[Xiaomi Mi A1 Guides, News, & Discussion] stelariusinfinitek:
Hi!

Since that post, I went back to Pie and realized again why I downgraded. I went again from Pie to Oreo March, I lost the signal (but not the IMEI!), updated to November, still no signal. Downgraded to Nougat, still no signal.

Then I did again this :

Flashed Oreo March (the firmware, not the OTA) through MiFlash (make sure you don't lock your bootloader!!!). After it flashed succesfully and it restarted the second time, I went straight to fastboot (Volume down+Power). Don't let it load the software. In fastboot, I booted twrp and restore boot+EFS partitions from this post (if it doesn't show up, make a backup in TWRP. In Windows, open the TWRP folder in your phone and search for that backup, replace everything from there with the backup from this post). After that, I rebooted to fastboot again and reflashed March Oreo. It worked flawlessly. Everything worked. I really wanted Nougat so I flashed Nougat after this. Just make sure you don't lock your bootloader and everything will be fine. I don't know what EDL is, I just flashed the firmware. I never lost the IMEI and I don't know how people lost it. I'm from Romania and I'm using a SIM, not two.

Good luck and believe me, this phone is great on Nougat.
[Xiaomi Mi A1 Guides, News, & Discussion] anshsharma240:
If everything goes fine after this procedure then can we lock the bootloader.
[Xiaomi Mi A1 Guides, News, & Discussion] RealMuzaffar:
[MENTION=9624590]rizkyxculture[/MENTION] can you please tell does this process wipes internal storage or not? I want to downgrade but i have alot of important data that will take so much time to transfer to pc that's why i am not downgrading
[Xiaomi Mi A1 Guides, News, & Discussion] hycraig:
it wiped my internal data when i did it but i backed it all up before i started
[Xiaomi Mi A1 Guides, News, & Discussion] pradhyu69:
getting error while restoring TWRP " backup partition not found : modem"

i still not getting IMEI and signals. I followed tutorial