If fw_all.bin IS 14.bin, would it not be an idea to correct the two bytes of the dumped 14.bin file in a hex editor so it is identical to the original fw_all.bin (except for having the FF's at the end) and flash it back into the zumo via microSD?

I know how to modify the file in a hex editor. Just need the exact syntax how to flash rgn14 back via microSD.