Question How do I unlock my bootloader on my oneplus 9 LE2115

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Senior Member
Jan 18, 2014
Hi... I want to unlock my oneplus 9 bootloader so I can install the pixen os but I don't see any guide here to do this.


Senior Member
Sep 15, 2007
Denver, CO
Saw your post and your answer wasn't clear... do I need to downgrade to unlock bootloader or do I need to downgrade to be able to install custom roms.
You have to downgrade to be able to use custom ROMs. The ROMs require Android 11 because apparently OnePlus posted incomplete/unusable sources for Android 12.

I don't know if the downgrade package re-locks the bootloader so I would just unlock the bootloader after you're back on OOS11. I had issues trying to unlock the bootloader after doing the OTA to the latest OOS11 so I personally would do it in this order:

1) downgrade to OOS11
2) unlock bootloader
3) OTA to latest OOS11
4) flash custom ROM


New member
Jun 5, 2017
This still doesn't work for me. I have downgraded to A11 and still get the error "FAILED (remote: 'Command not supported in default implementation')" The device shows up when I type fastboot devices but continues to return this error when attempting fastboot oem unlock. How do I fix this?
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