mmc dev 0 mmc erase 0 1000 mmc write <addr> 0 1 # write fresh bootloader (from Linux)
mmc info mmc part mmc rescan eMMC chips on Postal3 are BGA-153. Cracked solder joints are common due to thermal cycling. 5. Recovery Solutions 5.1 Software recovery (if eMMC responds) A. Reinitialize eMMC from bootloader postal3 emmc
If bootloader is accessible (U-Boot):