Fabs,
You can backup your firmware using S1fwx Firmware Extractor
http://www.mympxplayer.com/dload.php...ile&file_id=15.
You need to be very sure when flashing firmware that your new firmware is compatible otherwise you can kill your player. The only reason you would want to update firmware is if your current firmware was corrupt or you wanted to change some of the images used. You will not add any new functions by updating.
Hope this helps.