yashsingh1/xdaforums huggingface dataset:
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
The Nokia 7.2, surprisingly, comes with an unlockable bootloader. The information is shared by TechMesto and I am just re-using it to create this guide.

Notes:

Unlocking the bootloader may void the device's warranty.

All existing data on the device will be erased.

To unlock:

Update: Nokia has disabled the unlock ability with the December MR. You can only unlock if you downgrade your phone to an old release first. You can get it at Nokia Care or by buying remote flashing services.

Before you start: Make sure that you have platform-tools downloaded on your PC. You need to open a CMD or Terminal window in the folder where you have saved the platform-tools, unless you have installed them system-wide.

• First of all, enable Developer Options by tapping 7 times on BuildID in "About phone".

• Then go to developer options and enable OEM Unlocking option.

• Now reboot the phone into bootloader/fastboot mode. You can use the adb command:

adb reboot-bootloader

or else use hardware keys to reboot to bootloader mode.

• Make sure the phone is detected in fastboot mode. Then send the OEM unlocking command:

fastboot flashing unlock

• Confirm the unlock on the phone.

[IMG="Nokia 7.2 bootloader unlock confirmation"]https://www.techmesto.com/wp-content/uploads/2019/10/Nokia-7.2-UBL-prompt-500x375.jpg[/IMG]

• That's it!

You can also do the unlock_critical if you plan to flash the bootloader.
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
Reserved for future use.
[Nokia 7.2 Guides, News, & Discussion] KohGeek:
I am on a Nokia 7.2, a dual-sim variant with 6GB RAM and 128 GB ROM. The model name is TA-1196.

I am currently having issues with this method, whenever I try to flash unlock, prior to the V1.160 update, the fastboot will report back saying "Write to device failed (unknown error)".

If anyone would enlighten me I would be happy to hear.

Edit: Currently on build number 00WW_1_060

Edit 2.0: Works after updating to build 00WW_1_160. Seems Nokia enabled this method by mistake. Who knows?
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
Hi, looks like you were initially doing flash unlock instead of flashing unlock? And since there was nothing to flash, it failed.
[Nokia 7.2 Guides, News, & Discussion] KohGeek:
I was using flashing, and as my edit has said, it seems the option to unlock the bootloader was only enabled after version 160.
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
That's okay, but the output you got wasn't appropriate for that command. If the unlock support isn't allowed it will say "flashing unlock is not allowed". Or in case the bootloader isn't including that command at all, it will say "Unknown command".

I might be wrong too, but your output isn't something i've seen on any of the phones i've owned, whether unlockable or non-unlockable. That output is what I usually get when the command is not proper, or the drivers aren't properly installed or the fastboot device isn't properly responding. Rebooting to bootloader should usually fix it. At least it does on other Nokia and Sharp phones.
[Nokia 7.2 Guides, News, & Discussion] KohGeek:
I was curious too, it kicked me off the bootloader screen when I was doing that on version 060, but it seems all is well now
[Nokia 7.2 Guides, News, & Discussion] DIMICH666:
https://nokiamob.net/2019/11/02/off...nlock-the-nokia-7-2-and-nokia-6-2-bootloader/
[Nokia 7.2 Guides, News, & Discussion] Coolboy996:
I unlocked bootloader now how to root this phone they didn't released kernel source for preparing twrp should i root the phone with magisk patched boot.img??
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
You can use TWRP or patched image to root the 7.2
[Nokia 7.2 Guides, News, & Discussion] CGarz:
Can confirm that it is still unlockable. Got 2 of them today from Argos in the UK (Scotland). They are on 00WW_1_130 with security batch from 2019/08/05.

Only thing I had to do was enable internet and reboot to get the option to stop being greyed out.
[Nokia 7.2 Guides, News, & Discussion] allc0re:
Just got mine today and it forced a system update upon activation. I was unable to unlock the bootloader.
[Nokia 7.2 Guides, News, & Discussion] CGarz:
Are you sure? Has Horrendously Menacing Dicks actually started blocking people having reasonable control of their 7.2 devices after letting them have it for so long?
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
Yep. They blocked the ability with the most recent December MR.
[Nokia 7.2 Guides, News, & Discussion] CGarz:
Ah that sucks. Did you try connecting to the internet and rebooting? That enabled the option to enable OEM Unlocking in developer settings for me.
[Nokia 7.2 Guides, News, & Discussion] allc0re:
I was able to turn on OEM Unlocking in Developer Options, but running the command in fastboot failed.
[Nokia 7.2 Guides, News, & Discussion] CGarz:
That really sucks. Now no devs will buy it =(.
[Nokia 7.2 Guides, News, & Discussion] bkttk2:
I know they planned to lock it down ; however were you using the most recent fastboot (platform-tools). I know I had issues with not having most current versions.
[Nokia 7.2 Guides, News, & Discussion] Lamtanloc512:
I also can not unlock the bootloader after update security 05/12/2019...MB no longer unlockable bootloader any more.
[Nokia 7.2 Guides, News, & Discussion] bkttk2:
Think we may be out of luck then, but one last suggestion. I noticed when reading through the thread on user indicated they were using "flash" instead of "flashing" when trying to unlock the bootloader.

I know I personally did the same thing at first. Did anyone confirm that "flashing" was used?

I know the older methods used flash. Just asking.
[Nokia 7.2 Guides, News, & Discussion] montagsmodell:
how to downgrade to still unlock bootloader in 2020

Hi singhnsk and others,

I just bought the Nokia 7.2 last week because I found so many articles on the web explaining how to install custom ROMs. Just yesterday I found out it is not possible anymore since Nokias december update.

Singhnsk, you write in your initial post:

Can you please point me into the right direction how to downgrade my 7.2 to an older release first? Also, has anyone experience with that?
[Nokia 7.2 Guides, News, & Discussion] CGarz:
Can confirm that at least with old stock it is still unlockable. Broke my last one. Risked buying a new one today and thankfully it was on the September security patch.

Unlocking worked just fine. Didn't even have to reboot to get OEM Unlock to light up after enabling WiFi this time.

Was worried that since WiFi is needed to be enabled to get OEM unlock to light up that maybe unlocking could be blocked even on older versions. Nope, still unlockable =D
[Nokia 7.2 Guides, News, & Discussion] montagsmodell:
Are we talking about the build number? Mine is 00WW_1_390.

Any possibility to downgrade for real? How can I do that?
[Nokia 7.2 Guides, News, & Discussion] bkttk2:
Look in the ROMS section. There are a couple of posts identified as TOOLS.

I have not personally used either ; buy they are supposed to be able to provide ability to flash stock, to include downgrading.
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
Did you device come with the 1_390 update? Or it is the most recent that you have installed? It is with the December security patch?

If you have installed the most recent update yourself and it is still on December patch. Then you can change your boot slot to the inactive one. Then reboot the bootloader and issue the unlock command. Should do fine.

fastboot getvar current-slot
fastboot --set-active=b

(Change the "b" in the above command to "a" if you currently active slot is "b".

I can't say about the stability and reliability of a custom ROM though. There are bugs, if you can live with those.
[Nokia 7.2 Guides, News, & Discussion] CGarz:
If anyone does get a downgrade method working where the phone started with the crappy locked bootloader please post here how it's done. I would love it if this phone got some more developer love.

I think fastboot --set-active=other works as well.

Currently running the Lineage rom. The broken things are:

Double tap to wake

NFC

Bluetooth media audio (phone works fine)

fingerprint scrolling (authentication works fine)

Camera quality is poor

Other than that though it's great. Personally prefer it much more than stock.
[Nokia 7.2 Guides, News, & Discussion] k-ninja:
Thanks for this tip, I just picked up one of these today - was able to get the store assistant to confirm the date they recieved them so I knew I would be getting an older one. Got it home and found it had the 1_130 firmware but the OEM unlocking option was disabled. Initially I had no SIM or WIFI because I was scared the device would autoupdate, but as you said, had to turn on WiFi and reboot to get the option enabled.

I did have more trouble after that, the bootloader would crash when I plugged into my PC to unlock with fastboot, screen would drop back to white AndroidOne background with tiny text in top left "press any key to shutdown". I updated my android platform tools but that didn't help. In the end, it turned out to (probably) have been the cable I was using - my Oneplus 5T cable. When I swapped for the included Nokia cable it worked.

---------- Post added at 02:08 PM ---------- Previous post was at 02:07 PM ----------

Oh one more question - once the bootloader is unlocked will OTA updates still work? If so, will installing them relock the bootloader?
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
Hi, your updates should still work. The updates cannot lock the bootloader. Full updates will always install. Incremental updates will not install if you're rooted or you have tampered any of the device partitions.

However, remember that not only did they disabled the ability to unlock, they have also disabled the ability to lock the bootloader. So, if at some point you'd wanna lock it, you'll have to downgrade the phone first.
[Nokia 7.2 Guides, News, & Discussion] Drunkoslav:
So with which version did you phone come, please? You did not update, and unlocked bootloader without problem, with tutorial in this thread? And did you try downloading updates now? Thanks
[Nokia 7.2 Guides, News, & Discussion] k-ninja:
The factory installed firmware was version 00WW_1_130 with security patch from 2019/08/05. I specifically asked the store assistant to check the date they received their stock and requested one from their oldest batch which they got in August. If you want a phone without the new firmware installed, I suggest going to a place that probably doesn't sell a lot of phones (I went to harvey norman in Australia) as they are more likely to have old stock (though the 7.2 isn't a popular model anyway so you could get lucky anywhere I guess) and ask to check the receiving date.

The OEM unlocking switch was disabled in developer options when I first booted the phone, but I followed the advice in CGarz' post about enabling internet and rebooting to get it to enable. I was careful to disable "install updates on reboot" from the developer options before I tried this.

I haven't downloaded any updates yet, but raghu says I should still be able to until/unless I install custom recovery or root the device.
[Nokia 7.2 Guides, News, & Discussion] Drunkoslav:
Well, thank You so much for Your reply. I'll be getting my 7.2 probably next week, so i want to be ready to unlock bootloader and root. But i hope it's safe, don't want to brick phone first day lol.
[Nokia 7.2 Guides, News, & Discussion] bkttk2:
You will be fine.

Main thing to focus on is unlocking the bootloader. Review the process outlined in the forums.

Ensure you have most current platforms-tools and I recommend using a USB 2 port.

For your device you need firmware version 0130 or earlier to be able to unlock the bootloader.

Once bootloader is unlocked the hard part is out of the way. You can use device normally, and accept updates etc.

Bootloader will remain unlocked moving forward.

Rooting and/or customizations is where you will need to focus attention. Just note whether you choose to only use Magisk for root, or install TWRP you have to match (flash) the same img file that has been compiled for the current firmware version of your device.

If issues arise the Tools developed by [MENTION=492683]raghuvarma[/MENTION] are invaluable!

Hope this information helps.
[Nokia 7.2 Guides, News, & Discussion] DJBhardwaj:
Okay so I purchased the 7.2. It's running September 2019 security patch with 00WW_1_200 build number and OEM unlocking enabled.

I tried the ".\fastboot flashing unlock" command, but the PowerShell threw an error:

Using a USB 2.0 port.
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
Reboot the device to bootloader and try again. I think you'll need a different version of ADB and Fastboot.
[Nokia 7.2 Guides, News, & Discussion] DJBhardwaj:
I tried using my Macbook and it accepted the command in the first go.

But, I really wanna get it working on my PC as well. I know that ADB/Fastboot doesn't play that well with USB 3.0/3.1/3.2 and Ryzen PCs.

So, I made sure to use USB 2.0 ports on the front/rear I/O panel on my Intel PC. Even tried different USB cables to no avail.

The only thing new is that sometimes I get a bit different error, this is:

FAILED (Write to device failed ([B]Too many links[/B]))
fastboot: error: Command failed
[Nokia 7.2 Guides, News, & Discussion] strahota:
I have USB debugging enabled and OEM unlocking turned on.

fastboot flashing unlock - FAILED (remote: 'unknown command')

Fastboot devices is showing my device in bootloader mode, but flashing unlock returns unknown command.

What am i doing wrong ?
[Nokia 7.2 Guides, News, & Discussion] bkttk2:
Review comments on post above,

https://xdaforums.com/nokia-7-2/how-to/guide-unlocking-bootloader-t3994617/post81702993

See if any of the comments / suggestions help.
[Nokia 7.2 Guides, News, & Discussion] strahota:
Not sure if a clean downgrade path for those with a locked bootloader has been identified yet.

I guess ill keep digging ... and ill post here as soon as i find something useful.

Honestly, thank you for trying to help.

Much appreciated.
[Nokia 7.2 Guides, News, & Discussion] bkttk2:
Welcome.

A quick search on the file you referenced indicates that it is an actual zipped file.

I've not used it nor have any association with it so use at your own risk.

Here is where I found info of what is supposed to be in zipped file and how to use it.

Two links on site I found one to download file you referenced and other to link below.

Maybe it will help. Be sure to check files for bugs as I'm not saying this is the best way. I'm only trying to help with info we have at this time.

https://www.inarguide.com/install-rom-qualcomm-flash-image-loader-qfil/

NOTE: If you are successful I can vouch for the flash tools posted by [MENTION=492683]raghu[/MENTION]_varma
[Nokia 7.2 Guides, News, & Discussion] strahota:
QFIL is unable to detect device nor the rom.

I sent you one PM with more detailed explanation.

Also, after almost 2 days of searching, im almost ready to give up on this.
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
QFIL needs the device in Qualcomm's EDL programmer mode (9008 QDLoader). The only way you can trigger EDL on the Nokia phones is by disassembling the device and shorting the respective pins on the mainboard. Even then, the official firmware does not come with an EMMC programmer file for the device. And we cannot use a generic file since that can permanetly corrupt the EMMC and/or the SOC's memory.

The only meaningful means is via Nokia Care or using paid remote flashing services (which will use Nokia Care or other aftermarket paid tools) to perform a downgrade. The bootloader needs elevation before it will flash partitions on a locked bootloader. This is done by solving the one-time auth challenge and then passing the binary response to the device to get the repair permission up (

fastboot oem repair

). The only thing that can solve the challenge is an HMD Server which has the secret private key to sign the response after solving it in the required format. An unsigned response cannot work even if it carries the correct binary data within it.
[Nokia 7.2 Guides, News, & Discussion] strahota:
Thank you singhnsk for giving detailed explanation.

Ultimately, i decided to give up on this phone all together. I went back to the store and just got another brand / model.

Maybe there are no too many of us weirdos who like to have maximum freedom / control over devices that we buy, but Nokia is definitely not in a position to disregard any customer segment.

I wish Nokia all the best, but my Nokia is now returned to the shop mostly due to this limitation.
[Nokia 7.2 Guides, News, & Discussion] CGarz:
I totally agree couldn't agree more. It's so sad the state of Android these days. Ghoulgle should be forcing all these despicable manufacturers to allow more user freedom.

The only way currently is to try and buy old stock with unlockable firmware. It could be an option worth exploring for you. I had to do it when I broke my last one.

All the best anyway. Hopefully you can find one of the few shreds of freedom left in this desolate Android landscape.

Roll on proper Linux phones. :(
[Nokia 7.2 Guides, News, & Discussion] player18:
Is the bootloader still not unlockable after the upgrade to Android 10? I am considering this phone, but it REALLY bothers me not being able to unlock it once official support drops so that I could keep using an up-to-date custom ROM...

Nokia support said they are relying this information to the development team since it appears to be a very common feeling among current and potential users, but I have no real hope that they will do anything bout it.
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
Nothing still. The bootloader doesn't recognize the unlock commands. And the only way to unlock (still) is to go back to the previous version where it was unlockable by using a remote flashing service.

As for what's changed with Android 10, the bootloader unlocked warning now has a link to Nokia's support webpages, instead of the Google ones. Maybe they are planning sonething; maybe it's nothing.
[Nokia 7.2 Guides, News, & Discussion] player18:
Thanks for the reply, it sounds like we're still at the same point.
[Nokia 7.2 Guides, News, & Discussion] Arunragav:
will i receive future system updates from hmd if i just unlock bootloader without rooting and install viper4android flashable zip ??
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
Updates aren't impacted due to unlock status. You'll continue to get updates. However, in case you tamper any parts of the system or other partitions, you won't be able to install the update successfully. I believe that's same for any other OEM. Using Viper's systemless modules shouldn't cause any tampering though.
[Nokia 7.2 Guides, News, & Discussion] Arunragav:
Thanks for the info. Just to be clear.. I won't have problems with updates even if I unlock bootloader.. if I use the flashable zip for viper I think it's gonna install as system app, so that means I'll have trouble with future updates because of viper? And also u mentioned systemless viper module I think u r referring to magisk module? Updates won't get affected even if I root using magisk?
[Nokia 7.2 Guides, News, & Discussion] CGarz:
Correct.

Unlocking only will still allow OTA updates without issue.

Anything that changes a partition will stop updates working.

Such as TRWP or Magisk which change the boot partition, or other root methods which change the system partition.

Technically systemless modules don't change anything, but you need magisk to run them, so thats a mute point.
[Nokia 7.2 Guides, News, & Discussion] Arunragav:
Thanks a lot for the ones replying my queries.. it makes me understand this better every time there is a reply answer for my questions.. I'm little clear now about unlocking bootloader not affecting system updates.. the main problem as far as I can understand is there is no proper way to flash stock firmware for our 7.2. if that becomes possible we can root and do whatever we want and if some system updates r available we can flash stock firmware update the system updates and then root again.. which seems to be impossible now..
[Nokia 7.2 Guides, News, & Discussion] mahouka:
help!!

good afternoon, excuse me, my phone build number is 00WW_1_390 and I still see the OEM unlock in the developer option, so can I unlock the bootloader of the phone? my phone date modified is 5/12/2019
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
Hi, no, the unlock ability was removed with the December update. Only builds until 127B have the unlock ability available.
[Nokia 7.2 Guides, News, & Discussion] mahouka:
thanks sir.
[Nokia 7.2 Guides, News, & Discussion] Arunragav:
Download link to download the complete firmware seperately?? If that even available anywhere? Can someone help?
[Nokia 7.2 Guides, News, & Discussion] eX1337:
Hi Guys,

I successfully unlocked the Bootloader of my Nokia 7.2 to manually install the Android 10 Stock-OTA-ROM (Android 10.0.0 DDV2250 HOME BREW (March 2020)).

Today I received the first OTA-Update (V2.270) but I'm unable to install it. My Device is allways showing "Installationproblem" after a few Seconds.

Do I have to relock the Bootloader and wipe all Data to get OTA-Updates for my Stock-ROM working again?

I only unlocked the Bootloader to flash the Stock-ROM, there is no root, custom recovery or anything like that.

Thanks in advance!
[Nokia 7.2 Guides, News, & Discussion] bkttk2:
Unlocked bootloader should not stop OTA.

OTA typically will error if it detects any alterations with system files.

I have unlocked bootloader, and like you manually updated to Android 10. I had no issues with OTA.

However, I took the Nuclear route. I did a full factory reset of device while on Android 9. I then flashed Android 10.

Then setup device from scratch.

I would avoid a 'dirty flash' if you are manually updating.

REMEMBER TO BACKUP DATA IF YOU TRY THIS OPTION

Remember if you have loaded TWRP, or made ang other alterations the OTA will error.

Hope this info helps.
[Nokia 7.2 Guides, News, & Discussion] Nitish3026:
Help me unlock my bootloader for nokia 7.2 that is blocked by nokia in the update.

When is nokia going to re enable the bootloader unlock.

I am sick of this boring phone and as i came to know that nokia has disabled the unlocking feature I'm kinda broken, what should i do xda? Please help me out i can't live without custom roms and root.???
[Nokia 7.2 Guides, News, & Discussion] CGarz:
Probably when Ghoulgle decide to stop harvesting everyones data.

And when crapple stop gouging its customers.

And when there is world peace.

And when humans are living on Ganymede lol

In a nutshell. HMD are dicks and it will likely never happen.
[Nokia 7.2 Guides, News, & Discussion] huongthanh8690:
I have uploaded the latest version ... now how to download to the older version to unlock..thanks
[Nokia 7.2 Guides, News, & Discussion] CGarz:
I'm assuming that you mean your phone has updated to the latest firmware and that you want to downgrade.

In which case, sorry, you can't. As far as I know there is no way to downgrade because HMD are cûnts.
[Nokia 7.2 Guides, News, & Discussion] barbaross:
Hello everybody

i have a question there is no way to unlock nokia 7.2 or do a doawngred without paying techmesto can someone help
[Nokia 7.2 Guides, News, & Discussion] voyager529:
Honestly...have Narender do it. He's incredible at the process, and he never got my phone into a jam that he didn't ultimately get it out of.

10/10, will 100% be hiring again to do my next phone.

(check my profile; I've been on XDA since the WinMo days; not a shill, just a *VERY* happy customer)
[Nokia 7.2 Guides, News, & Discussion] singhnsk:
One way would be to visit a Nokia Care and ask them to flash the device to the older firmware. There's no way to downgrade on one's own capacity. All flash attempts should be authenticated from hmd 's signing server. No free tools manage to do that :)