Congratulations! Your OnePlus 3T is alive again. But you are not done yet.
: Open Device Manager on your PC. The device should appear under "Ports (COM & LPT)" as Qualcomm HS-USB QDLoader 9008 . oneplus 3t unbrick tool
The (MsmDownloadTool) is the ultimate safety net for users who have "hard bricked" their device —meaning the phone shows nothing but a black screen and fails to boot into Recovery or Fastboot mode. Congratulations
is completely powered off. If it is stuck, hold the for about 40 seconds to force a shutdown. : Open Device Manager on your PC
The unbrick tool restores the phone to 100% stock OxygenOS with a locked bootloader. If you want to flash custom ROMs again, you will need to re-enable OEM Unlocking in Developer Options and run fastboot oem unlock .