Many OnePlus devices ship with "AVB 2.0" enforced. Users report that omitting the --disable-verification flag leads to a bootloop with "ERROR: Slot Unbootable." The working command is:
The final line appeared:
adb shell su dd if=/dev/block/by-name/vbmeta of=/sdcard/vbmeta.img vbmeta disable-verification command
: Tells fastboot to write the image to the vbmeta partition. Many OnePlus devices ship with "AVB 2
Then pull it via adb pull .