Actual stock reset of OnePlus 7T (0'ed disk)

I own an old 7T and played a lot with it. I probably caught some bad piece of malware at one point because one day the battery was drained like hell and it became slow. I did some factory resets but it did not help.

But I don’t think factory resets were enough, because after a reset I’m asked for my previous screen lock. It lets me think that not everything is wiped. My malware (if any) could survive a wipe…

How can I better clean all bit of data/code on my OP7T like a complete hard disk formatting? And then get the old stock ROM installed on this blank space :wink:

Thank you for your help, have a nice day.

One explanation might be that all accounts, especially any Google account was not removed before Factory reset. I would concentrate on this before diving deeper.

Is the phone on /e/OS or OxygenOS or something else at present? You may get inspiration from this thread but Android does not make your proposal especially easy!

Restore your OnePlus 7T complete and full via stock ROM OxygenOS using fastboot commands (this is not comparable to a factory reset):

  • (fastboot flashing unlock) - if not yet done
  • fastboot flashing unlock_critical
  • fastboot -w
  • fastboot flash aop_a aop.img
  • fastboot flash aop_b aop.img
  • fastboot flash bluetooth_a bluetooth.img
  • fastboot flash bluetooth_b bluetooth.img
  • fastboot flash boot_a boot.img
  • fastboot flash boot_b boot.img
  • and so on
  • fastboot reboot OR (fastboot reboot bootloader)

Thank you for your fast answer. It’s back on Oxygen. All accounts were removed I guess. But now I have a little doubt :face_with_monocle: I’ll check again, thank you :blush:

Oh OK that looks violent, that’s what I need!
I’ll post updates here.
Thank you :blush: