It might be obvious but is the command complete?
Error 3 = Unsupported command…
try
$PAIR003*39 disable gnss
$PQTMVERNO*58
$PAIR514*3A Clear the current configuration and restore the default settings.
$PQTMRESTOREPAR*13 restore default
$PAIR513*3D save file system
$PQTMSAVEPAR*5A save parameters
$PAIR511*3F Save current navigation data from RTC RAM to flash
$PAIR023*3B → reboot
ask for a copy of fw and reflash.
here a tread: