[SOLVED] After updating won't boot...

[longpanda]

The MBR is completly overritten.
Please run (assume that the Ventoy USB is /dev/sdb,  if not you must change the command)

Code:

sudo sh Ventoy2Disk.sh -u /dev/sdb
if=/dev/sdb of=3.bin bs=512 count=1

after that upload the 3.bin and the output log here.