You tried to flash a non-vbmeta image (e.g., boot.img) to the vbmeta partition. Fix: Double-check the filename. It must be vbmeta.img .
By 2021, almost all modern devices (specifically Pixels and newer Xiaomi/Oppo devices) used "System-as-Root." This meant the system partition was mounted as root, and the boot partition contained the ramdisk and kernel. Modifying the boot partition was now mandatory for root, but doing so broke the AVB hash stored in vbmeta . The disableverification command became the only way to bridge this gap. vbmeta disableverification command 2021
: Use adb reboot bootloader to enter the correct mode. Execute the Flash : Run the command mentioned above. You tried to flash a non-vbmeta image (e