Rename mbr0.prc mbr0.img
Ok, proceed slowly.
Code:
edl /u0 /w /s0 /c1 mbr0.img
Go to recovery, flashing misc if necessary.
ADB
Code:
ls -l /dev/block/sda*
See lots of stuff? If not, stop here.
If there is a problem with recovery getting the screen try recovery again and as soon as ADB connects
Code:
stop blinky
start recovery
Got a menu? Select factory reset.