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How to downgrade Android 8.1 to 8.0 ( December to November)

Hi all, currently running my pixel 2 on latest Dec security patch. 8.1. However due to bug in bootloader (66) unable to unlock the device. I can RMA but still want to know is there any way to revert back OTA update ?
I tried using OTA side load from Recovery but its giving me error saying current timestamp is newer than OTA so failing.
Any tweak to downgrade ?

rohanhole said:
Hi all, currently running my pixel 2 on latest Dec security patch. 8.1. However due to bug in bootloader (66) unable to unlock the device. I can RMA but still want to know is there any way to revert back OTA update ?
I tried using OTA side load from Recovery but its giving me error saying current timestamp is newer than OTA so failing.
Any tweak to downgrade ?
Click to expand...
Click to collapse
As far as i know u cant downgrade. Regarding the bug in bootloader unlocking, that has been solved. Restore factory your device and you should be able to unlock bootloader.

infamousvincci said:
As far as i know u cant downgrade. Regarding the bug in bootloader unlocking, that has been solved. Restore factory your device and you should be able to unlock bootloader.
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Click to collapse
I tried but facing issue. Its toggling but at the time of flashing fastboot command its saying locked.
I doubt something broke in 66 version of bootloader. That's why wanted to be on previous version to check the solution

rohanhole said:
I tried but facing issue. Its toggling but at the time of flashing fastboot command its saying locked.
I doubt something broke in 66 version of bootloader. That's why wanted to be on previous version to check the solution
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Click to collapse
What command are u running? And what is the error that shows

infamousvincci said:
What command are u running? And what is the error that shows
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Click to collapse
Described in https://issuetracker.google.com/issues/68897739#comment119
Read last comments ! You will realise.

rohanhole said:
Described in https://issuetracker.google.com/issues/68897739#comment119
Read last comments ! You will realise.
Click to expand...
Click to collapse
Prolly yeah. But i was able to unlock bootloader on 2 pixel 2 phones running 8.1. mine and my fiance. Prolly weird and rare bug

Lets discuss twrp and rooting this device.

so per xda rules i cannot post where to go to unlock your bootloaders on the nokia 6.1 but if you google search you will find it. it's $5 and you provide your IEMI and i had the code and was unlocked within 10 minutes.
im not a dev but id love to start a discussion on how to build twrp and achieve root. i wanted to extract my boot.img and try to patch with magisk but im positive you need twrp to see the partition scheme and temp root to make a system dump. since this is an android one device its possible it follows the pixel scheme and has a/b partitions which makes it even harder for development of roms. but root should be possible if we have someone with the knowledge how to achieve it.
i just wanted to start a discussion and see where this takes us. this is a nice budget device and it deserves root.
im still not sure why its against the rules here to pay for a unlock when jcase used to promote the sunshine app to s-off and unlock bootloaders for $25 per phone.
ive attached a screenshot of my unlocked bootloader so people don't think im full of it. i have the USA 32gb / 3gb ram model from best buy.
let the fun begin! :fingers-crossed:

What carrier do you use? Does your phone normally after unlocking bootloader?

Hedied4me said:
What carrier do you use? Does your phone normally after unlocking bootloader?
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its a gsm unlocked phone but I use it on tmobile. yes its works fine. once you unlock the bootloader it does factory reset and wipe data.

it seems the only way to do a system dump is to buy a edl usb type c cable since we have no temp root or official firmware from nokia. if anybody has one of these cables and gets their bootloader unlocked we can get a system dump including the recovery.img to build twrp and the boot.img to patch with magisk.

I succed to unlock bootloader. I pay for it. I want to back up rom and find way to make custom recovery to flash magisk

why your bootloader ui is different ?
there's a word "one" after "android" ?
---------- Post added at 02:15 PM ---------- Previous post was at 02:13 PM ----------
is there any twrp for nokia 6.1 ?

fix-this! said:
it seems the only way to do a system dump is to buy a edl usb type c cable since we have no temp root or official firmware from nokia. if anybody has one of these cables and gets their bootloader unlocked we can get a system dump including the recovery.img to build twrp and the boot.img to patch with magisk.
Click to expand...
Click to collapse
i have no knowledge to back up stock rom and recovery

Shame no magisk currently or I would be off to buy a unlock key! Bought this phone on contract a month or two ago and am kinda missing magisk.

Just got my Nokia 6.1 yesterday. Got it unlocked. Any updates on rooting with Magisk?

I'll try with it tonight to check if any chance to do twrp and root our Nokia 6.1

Maherabed1986 said:
I'll try with it tonight to check if any chance to do twrp and root our Nokia 6.1
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Keep us updated... Thank you

Danny1976 said:
Just got my Nokia 6.1 yesterday. Got it unlocked. Any updates on rooting with Magisk?
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How did u unlocked and rooted it please tell me i wanna improve battery life and want on Android P on it please help

Sameervillain said:
How did u unlocked and rooted it please tell me i wanna improve battery life and want on Android P on it please help
Click to expand...
Click to collapse
You should read/search more...
In almost every thread is link how to unlock (because people needs to talk about that everywhere), for now no option to root, unless we have TWRP or the boot image. And you need to wait for Android P, it should be out in August, I think...
Sent from my Lenovo TB-8704F using XDA Labs

fix-this! said:
it seems the only way to do a system dump is to buy a edl usb type c cable since we have no temp root or official firmware from nokia. if anybody has one of these cables and gets their bootloader unlocked we can get a system dump including the recovery.img to build twrp and the boot.img to patch with magisk.
Click to expand...
Click to collapse
I can buy the cable and try to do that. I never done it, but I can Google it and try it.

I ordered the cable yesterday. I will try to get the files necessary for TWRP.

Danny1976 said:
I ordered the cable yesterday. I will try to get the files necessary for TWRP.
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No need i have it worked already need to fix last backup issues then boom

Maherabed1986 said:
No need i have it worked already need to fix last backup issues then boom
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Click to collapse
It only cost me $8, but I least I have it for future usage or to fix phone if bricked. Thanks for working on rooting this device. Everyone will be grateful for you time and work. I don't think I would have the knowledge needed to do it and would have had to do some research to learn about it. Thank you.

If someone make a twrp we can root it throw magisk. I am on android p

chriskleov said:
If someone make a twrp we can root it throw magisk. I am on android p
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Click to collapse
How us P compared to Oreo ? Speed and fluidity .?

I think oreo has better battery. P never stuck very quickly Rom and stable. Now that on holidays I found a new add. You can use phone and Google maps can run in.small window! Usefull .. the ROM came with the basic stock Google tools. I like it. I don't like that I can't make modifications like xposed remove some Google apps like player and add others. I don't like that Nokia hasn't software that you can unbrick your phone (lg has the lg bringe). I don't like that Nokia isn't official unlock the bootloaders.

Re-lock bootloader

Is it possible to relock bootloader on XA2 Ultra?
Thanks.

No.

apparently it can be done ! Look here ! http://4mobiles.net/android/tutorials-android/sony/relock-sony-bootloader/

icutzo said:
apparently it can be done ! Look here ! http://4mobiles.net/android/tutorials-android/sony/relock-sony-bootloader/
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Click to collapse
I wouldn't take a two year old article as necessarily accurate for newer phones, nor trustworthy no matter what. Until someone reports success with it, I'll still tell anyone who asks "no". ?

Hello, my Xperia xa2 ultra (H3213) don't relock bootloader... And I can not flash firmware because I find no version "STOCK" for this version

roirraW "edor" ehT said:
I wouldn't take a two year old article as necessarily accurate for newer phones, nor trustworthy no matter what. Until someone reports success with it, I'll still tell anyone who asks "no".
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Click to collapse
The method in the link is accurate, I have done it many times

nkhater said:
The method in the link is accurate, I have done it many times
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Click to collapse
what model did you use ? xa2 ultra ??

itmasen1 said:
what model did you use ? xa2 ultra ??
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Click to collapse
I used a XA2 Ultra and can confirm that DOES NOT WORK!
So that 2+ years old link is BS.

hi everyone, i need to relock bootloader on h4213 too, maybe some help guys please?

Replace the motherboard with a new one.

uhh, anything else possible maybe perhaps, please??

maxis123 said:
uhh, anything else possible maybe perhaps, please??
Click to expand...
Click to collapse
If it help you :
https://forum.xda-developers.com/xperia-xa2/help/xa2-plus-relock-bootloader-t3893979

so.. im screwed, i can only buy new board wich is not an ootion for me.. (
thanks for answer

annddyy81 said:
Is it possible to relock bootloader on XA2 Ultra?
Thanks.
Click to expand...
Click to collapse
How did u unlock your bootloader on that phone because when I do it it says waiting for device in the adb on the computer and I did everything else right I think any ideas

I unlocked mine by installing fastboot drivers for the XZ2. It kept hanging up on 'waiting for device's too. But worked after installing those drivers. I can't figure out how to flash twrp though. I get error 'no such partition'.

Damn! ...
itmasen1 said:
If it help you :
https://forum.xda-developers.com/xperia-xa2/help/xa2-plus-relock-bootloader-t3893979
Click to expand...
Click to collapse
That evil misleading boot screen message for this phone, for the longest time I felt reassured that should the time come that I'd want to sell my phone that I'd be able to "lock the bootloader". I never really looked into it because of that message... Until now, when I want to actually sell it!
Obviously this confirms otherwise. It's a shame I cant just relock it and sell it on

Unable to unlock bootloader (OEM unlocking disabled)

Hello,
I couldn't unlock the bootloader as the OEM unlocking's disabled and i can't access system! Everything's erased!
Any help????

A bit more info might be helpful mate.
What did you do to arrive at the situation you are in?
Can your pc see your device via ADB and if so what are you using: latest platform tools or toolkit?
Can you boot to stock recovery or bootloader?
Without any of the above info its going to be extremely difficult for anyone to give any kind of answer.

junglism93 said:
A bit more info might be helpful mate.
What did you do to arrive at the situation you are in?
Can your pc see your device via ADB and if so what are you using: latest platform tools or toolkit?
Can you boot to stock recovery or bootloader?
Without any of the above info its going to be extremely difficult for anyone to give any kind of answer.
Click to expand...
Click to collapse
The device isn't recognized via ADB.
I can boot to Bootloader
The phone was working fine with the latest google stock android 10, i decided to lock the bootloader cuz the phone was getting overheated so i thought it'd be a good idea to lock the bootloader. Prior to do that, it asked me to erase everything! I erased everything and when i tried to reinstall the stock image it asked me to unlock the bootloader!!
The problem is that USB debugging isn't enabled and the phone is empty with no system!

eldeen said:
The device isn't recognized via ADB.
I can boot to Bootloader
The phone was working fine with the latest google stock android 10, i decided to lock the bootloader cuz the phone was getting overheated so i thought it'd be a good idea to lock the bootloader. Prior to do that, it asked me to erase everything! I erased everything and when i tried to reinstall the stock image it asked me to unlock the bootloader!!
The problem is that USB debugging isn't enabled and the phone is empty with no system!
Click to expand...
Click to collapse
Ouch! That's a right old situation you have there mate, with no OS installed a locked bootloader and no ADB function I'd have to say your phone is non recoverable!
Sorry mate but I can't see anyway out of that lot.
Maybe someone else a bit more knowledgeable might chip in but I'm deffo out of ideas.

junglism93 said:
Ouch! That's a right old situation you have there mate, with no OS installed a locked bootloader and no ADB function I'd have to say your phone is non recoverable!
Sorry mate but I can't see anyway out of that lot.
Maybe someone else a bit more knowledgeable might chip in but I'm deffo out of ideas.
Click to expand...
Click to collapse
Thanks for help anyway,
But there must a solution to this! I mean my phone isn't under warranty and I'm willing to go for paid services to unlock the bootloader!

eldeen said:
Thanks for help anyway,
But there must a solution to this! I mean my phone isn't under warranty and I'm willing to go for paid services to unlock the bootloader!
Click to expand...
Click to collapse
Try switching slots, assuming the pixel is an A/B device. Maybe you still have a bootable system in your other slot and I don't think you need an unlocked bootloader to switch slots

AndroidNazi said:
Try switching slots, assuming the pixel is an A/B device. Maybe you still have a bootable system in your other slot and I don't think you need an unlocked bootloader to switch slots
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Click to collapse
Thanks for help, but could you please show me how to do that?

eldeen said:
Thanks for help, but could you please show me how to do that?
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Click to collapse
Make sure you have the latest fastboot. On the bootloader your phone will either say "slot a" or "slot b" and you should type "fastboot --set-active=b" if you are on slot a or "fastboot --set-active=a" if you are on slot b

still didn't fix the problem... any probable solutions please?

Question Can´t access to fastboot

I am trying to unlock my nord ce 2 bootloader but everytime I try to access bootloader mode, it says something like Unlock_Verify_device ok and then reboots
how can I unlock the bootloader? Same happens on my nord 2. Oem unlocking is enabled and I have no selection of advanched startup options. I have magisk boot.img to flash

Can't say I experienced that myself. The message you got looks promising. The 'unlock_verify_device ok' message means you're getting to fastboot. But I'm not sure why it's rebooting. Do you have enough time to run the command 'fastboot devices'?
Also, what version is your firmware?
Here is the guide I used when I was unlocking the bootloader: https://www.droidwin.com/how-to-unlock-bootloader-on-oneplus-nord-ce-2/

I am running android 12 beta on oxygenos
Edit: fastboot doesn´t even find the device
Oh, now it tells that serial is not match. what's going on?

so? Can anyone help? Phone keeps saying that serial is not match and then reboots. Is this phone just a joke or something? Gonna buy samsung if yes.

What model is your phone? I wasn't aware of the Android 12 beta being available for the Nord CE 2. Another thing to try is this tutorial to manually install the OnePlus drivers: https://www.droidwin.com/fix-android-device-not-showing-in-fastboot-mode/

Was looking on the nord ce 1 xda Forum. It's only recently that a few roms and twrp are starting to appear, so there is hope. IMO oneplus need to take £$50 off the price, more users = more chance of getting more development

mr_munch said:
Can't say I experienced that myself. The message you got looks promising. The 'unlock_verify_device ok' message means you're getting to fastboot. But I'm not sure why it's rebooting. Do you have enough time to run the command 'fastboot devices'?
Also, what version is your firmware?
Here is the guide I used when I was unlocking the bootloader: https://www.droidwin.com/how-to-unlock-bootloader-on-oneplus-nord-ce-2/
Click to expand...
Click to collapse
I don't have fastboot on my device Nord ce 2 ..when I type fastboot reboot bootloader then it directly reboot into my device ..Please somebody help me.Im on current Android 12.1 version

neilop7 said:
I don't have fastboot on my device Nord ce 2 ..when I type fastboot reboot bootloader then it directly reboot into my device ..Please somebody help me.Im on current Android 12.1 version
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Click to collapse
Fastboot is stuffed on this device. There's no longer a way to make fastboot work.

burningcreation said:
Fastboot is stuffed on this device. There's no longer a way to make fastboot work.
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Click to collapse
I wanna unlock bootloader..is there any way to unlock ?

neilop7 said:
I wanna unlock bootloader..is there any way to unlock ?
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No unfortunately.

burningcreation said:
No unfortunately.
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Did you able to unlock bootloader?

neilop7 said:
Did you able to unlock bootloader?
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Click to collapse
No I am not able to unlock the bootloader either. There is currently nothing we can do.

Hi everyone, any update on this? Did someone manage to unlock the bootloader?

If I'm not mistaken. You can rollback to android 11 to get it back.

I'm currently facing the same problem, so I tried rolling back and have downloaded over 20 rollback zips now, and extracted them. All won't work, it reboots in recovery. And it is like fastboot just doesn't exist. So yeah they probably messed it up.
I'm so sad, I switched from Iphone to Oneplus partly because of the rooting options. So sad
Can I do this trough adb or not?

NiekKamer0105 said:
I'm currently facing the same problem, so I tried rolling back and have downloaded over 20 rollback zips now, and extracted them. All won't work, it reboots in recovery. And it is like fastboot just doesn't exist. So yeah they probably messed it up.
I'm so sad, I switched from Iphone to Oneplus partly because of the rooting options. So sad
Can I do this trough adb or not?
Click to expand...
Click to collapse
You don't extract it though. You just rename it by removing the _Rollback at the end.
See here: https://droidwin.com/downgrade-oneplus-nord-ce-2-from-android-12-to-android-11/