My OnePlus2 (I think using OxygenOS) displays start icons (normal logo and fastboot, depending on how I boot it), however, afterwards the screen always remains black, while the phone responds to key presses.

Booting in recovery mode starts up the phone too, but never displays anything.

I tried to clear the cache using fastboot (following the fastboot-info on here), but get this response:

$ fastboot erase cache
******** Did you mean to fastboot format this ext4 partition?
erasing 'cache'...
FAILED (remote: device is locked. Cannot erase)
finished. total time: 0.020s

When I tried to unlock, following the -help suggestions, e.g.:

  flashing unlock                          Unlocks the device. Allows flashing
                                           any partition except
                                           bootloader-related partitions.

But it doesn't work:

$ fastboot flashing unlock
FAILED (remote: unknown command)
finished. total time: 0.006s

And another command I read about seems disabled:

$ fastboot oem unlock
FAILED (remote: oem unlock is disabled)
finished. total time: 0.009s

Is there another way I can erase the cache using fastboot or adb? I hope clearing the cache might resolve the black screen issue on my phone.

  • Black screen in recovery too, doesn't seem to be /cache related. Anyway: On your phone go to Settings > Developer options. Then enable the 'OEM Unlocking' option.: forums.oneplus.com/threads/…. A little bit search is usually helpful. – Irfan Latif Jul 11 at 7:31
  • Hei, thanks for your comment @IrfanLatif - do you have an idea what else it could be related to if it's not the cache? I've found multiple resources online that mentioned that black screen on startup might get resolved with clearing the user cache, so that's why I've been trying to do that. – martin-martin Jul 12 at 2:35
  • Might be the /cache is responsible. But device should boot in recovery mode at least. – Irfan Latif Jul 12 at 7:28

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