replace /dev/emmc with appropriate /dev/mmcblkX (where X=0,1,2,,, whichever)
lsblk,,, the one with .../boot[0,1]
Do NOT use any partition, just the whole raw device
lsblk,,, the one with .../boot[0,1]
Do NOT use any partition, just the whole raw device

PBP won’t boot from eMMC after Debian update / Tow-Boot installer won’t boot from SD
