jigoku , try all the v9.0.xx series firmwares here
http://www.mympxplayer.org/actions-9...mare-dc37.html
As there is no way of telling which firmware would work properly with your player, you'll need to try all of them until you get your player working again.
If the upgrade tool always hang while flashing the firmware, try uninstall and re-install another version of MP3 Utilities. There are many versions available in the downloads section.