Khang, I'll try my best to find the correct firmware for you if you get the board id. Hopefully the list of firmwares on s1mp3.org matches your board.
If you're still having trouble with the upgrading tool, then I think you're gonna have to short circuit your player. You said it gave you a message like "read information failed." Most likely, the upgrade tool is having trouble reading the firmware that is currently in your player because it may be corrupted...so it comes up in recover state, tries to recover it, and causes further errors.
When you open your player to get the board id, short circuit it and then try to upgrade with any of the firmwares that you have tried previously. Try with one that didn't give you the message "unknown flash type." This should get it out of recover mode and you should see the disk driver icon in win explorer.
Look here if you need a guide to short the pins:
http://mympxplayer.com/viewtopic.php...=asc&&start=30
Once you get the upgrade tool to work fine, then proceed on to get the correct firmware and upgrade with it to completely fix your player.
Keep trying to contact your seller though.
Post the board ID and I'll see what I can do.