$ fastboot flash userdata && fastboot flashall
Sending 'userdata' (17208 KB) OKAY [ 0.610s]
Writing 'userdata' OKAY [ 0.366s]
Finished. Total time: 1.111s
--------------------------------------------
Bootloader Version...: b1c1-0.2-5672671
Baseband Version.....: g845-00086-191011-B-5933466
Serial Number........: 8B3Y0TEH6
--------------------------------------------
Checking 'product' OKAY [ 0.060s]
Setting current slot to 'a' OKAY [ 0.219s]
Sending 'boot_a' (65536 KB) OKAY [ 1.960s]
Writing 'boot_a' OKAY [ 0.676s]
Sending 'dtbo_a' (8192 KB) OKAY [ 0.350s]
Writing 'dtbo_a' OKAY [ 0.106s]
Sending 'vbmeta_a' (4 KB) OKAY [ 0.120s]
Writing 'vbmeta_a' OKAY [ 0.063s]
Rebooting into fastboot OKAY [ 0.060s]
< waiting for any device >
fastboot: error: Failed to boot into userspace fastboot; one or more components might be unbootable.