Unbricking a Hard-bricked OnePlus 8/8 Pro
And if you cannot boot into Fastboot/Recovery mode either, it means that you cannot install the stock firmware by flashing the Fastboot ROM or Recovery Mode to unbrick it easily. If your OnePlus 8/8 Pro ticks any of the signs listed above, then it’s probably hard-bricked. Your phone shows the Qualcomm CrashDump Mode screen and is identified as ‘ Qualcomm HS-USB Diagnostics 900E‘ in Device Manager when connected over USB.When connected to a Windows PC using a USB, the phone is detected as ‘ QUSB_BULK‘ or ‘ Qualcomm HS-USB QDLoader 9008‘ interface under Windows Device Manager.That’s because the secondary bootloader is inaccessible. Your phone shows a black screen and might just vibrate when connected to the wall charger or the computer over USB.
A simple way to check this is by holding the Volume Up and Power buttons together while the phone is switched off. Your phone doesn’t boot into Fastboot and Recovery modes even after pressing the proper button combination.Your phone shows the ‘ Your Device is corrupt‘ message while booting and performing a factory reset doesn’t make any difference.
