I have this EXACT problem, and i live in the UK so cant send it in for an update
iv managed too "unlock" the update button, but it doesn't do anything because its doesn't think the prs500 is connected. even though its in device manager. is there any way i could force it too connect? or maybe i could flash it with a SD card?
i think its due too the fact i had the latest firmware on the reader.
any help? Please?