Oneplus 7 Pro unlock bootloader does not work [SOLVED]

/e/OS Devices OnePlus
1

I bought another Oneplus 7 Pro GM1913, I tried to use easy install but I get stuck unlocking the bootloader. Tried the manual installation method but exactly the same problem.

I am getting this error message

fastboot oem unlock
FAILED (remote: 'Device cannot be unlocked for technical reason.')
fastboot: error: Command failed

Chat gpt says sometimes you have to wait for a week to be able to unlock the bootloader after a factory reset.

Any suggestions are very welcome. Maybe one of you guys have a idea @piero @voorstad @aibd perhaps?

Thanx a lot!

Regain your privacy! Adopt /e/OS the deGoogled mobile OS and online servicesphone

2

Yes, you have to rollback to Android 11 to unlock:

This is a Oneplus bug in Android 12. Seems you forgot about it. :wink: .That is why I document it on this forum. :blush:

Oh, and don’t feed ChatGPT. You need to put water in the USB port and leave it with some salt for about a week. The error Command Failed dissolves itself when singing or whistling the Birds song. Sometimes the A-team tune helps as well.

3

Thank you very much. This is the oneplus 7 pro not a Oneplus 7. I managed to install e/os on a Pro before using the side load method. At least when I remember correctly. The files in your thread are not accescible any more

4

A month ago I did install eos on a Oneplus 7 pro. Did you read my comment about changing the prefix URL? Oneplus moved the files download to AWS.

The EU file for the Oneplus 7 pro links to:

https://oxygenos.oneplus.net/OnePlus7ProOxygen_21.E.41_OTA_0410_all_2112101752_downgrade_3821c2d4496c48fc.zip

And needs to be changed into:

https://s3.amazonaws.com/oxygenos.oneplus.net/OnePlus7ProOxygen_21.E.41_OTA_0410_all_2112101752_downgrade_3821c2d4496c48fc.zip

Have fun!

1 Like
5

Sorry, to many hours of trying ;-). Did not read good enough. It worked!

6

Good!

Did you whistle the birdssong or the A-team tune to get the error solved?

1 Like
7

One last question. What should the downloaded file be renamed in?

8

:rofl: :joy: :sweat_smile: of course I did

1 Like
9

If I remember correct, you can just use the downloaded zipfile. The manual update gives the extract option.

10

It says it refuses to downgrade to avoid boot mistakes.

11

Famous last question. I just put the file in Downloads if I remember correct

12

Got me there ;-). It refuses to downgrade. I tried installing it following the below guide lines. It then gives me a verification error.

Go back to Settings -> About device -> Up to date -> Click the top right button -> Local install -> Click on the corresponding rollback package -> Extract -> Upgrade -> System upgrade completed to 100%
13

Not sure. Seems renaming is important. Can’t remember, Did you try renaming to:

OnePlus 7 Pro (EU)

14

It did recognise the file with the older update app. I am now back in 11. Time to check if it will unlock, I will let you know once the mission is accomplished ( thanks to you).

Update: System got unlocked huurah!
Got stuck again at “Flashing additional partitions”.

Will proceed tomorrow.
Wonder if I just can’t flasg recovery image and ADB side load e/os
to bypass this problem.

PS C:\platform-tools> .\fastboot flash dbto dtbo-e-2.9-a14-20250321478411-community-guacamoleb.img
Warning: skip copying dbto image avb footer (dbto partition size: 0, dbto image size: 25165824).
Sending 'dbto' (24576 KB)                          OKAY [  0.550s]
Writing 'dbto'                                     FAILED (remote: '(dbto_b) No such partition')
fastboot: error: Command failed

Update:
Turned out to be a typo :slight_smile:
Mission accomplished ! Thanx a lot!

1 Like
15

You see, all installation errors for /e/os can be solved by whistling a good song! :hugs:

16

And someone willing to listen to your tune

1 Like
17

BTW, perhaps you can mark the topic to SOLVED now?

1 Like