Originally Posted by snappy46
"To find out what bootcode you have enter "stop" then "pause" in the PBO default screen. Being at P04 does not mean that you have bootcode 18."
Attempting to upgrade to firmware p05 on a pbo that does not have bootcode 18 (or higher) will brick your device.
Bootcode 20 has been alluded to on the Patriot's PBO product page and nowhere else. Perhaps later model pbo's are shipping with bootcode 20. Perhaps it is a typo.
Bootcode version checker (for future searchers)