To actually have a chance of fixing the issue, the users will have to have a nand.bin dump file saved, and you will need to flash the nand file back to the console using a hardware flashing method, there is no other way of recovering
You can check the SD card in each console to see if there is a nand dump, but if they followed the tutorials the nand backup should be stored in a safe place, with no nand backup I'm afraid it's no recovery for them
You can check the SD card in each console to see if there is a nand dump, but if they followed the tutorials the nand backup should be stored in a safe place, with no nand backup I'm afraid it's no recovery for them