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Question OnePlus 9 screen won't turn on after attempting to flash stock ROM.

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winterfoxx

Senior Member
Jun 11, 2020
71
8
So, I was attempting to downgrade to a stock ROM using a tool I found on this form. It flashed the A partition, then got stuck waiting for devices. My phone's screen was blank, and it wasn't responding to anything. Windows was constantly playing a connected and disconnected tone with around 7 second intervals. Please help! Don't really want to send my phone to OnePlus so they can fix it lol.
 

winterfoxx

Senior Member
Jun 11, 2020
71
8
It appears to be bootlooping (nothing on the screen tho). I've tried everything I can to get it out of the bootloop, but nothing.
 
It appears to be bootlooping (nothing on the screen tho). I've tried everything I can to get it out of the bootloop, but nothing.
Did the zip have downgrade in the title. If so you are fine you just need to hold all vol buttons and power button until it goes to fastboot. Then wipe the phone.(all data needs to be wiped when downgrading)
If this doesn't work you to use the msm tool
 

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