Batuhan Kıl&, Sometimes after mutiple connections and flashes Windows and the MP3 Upgrade tool can get a little hung up. Try Uninstalling MP3 Player Utilities and install a different version connect your player to a different USB port preferably one you have not used the player on before.
Then try upgrading with a full firmware, if it loads to your player and your player becomes recognised as a removable device again then start loading dump files to it.

Re: dead player K9K8G08U0M SAMSUNG 610
 

Man you must have bought it from gittigidiyor.I also bought form there and writes TR88 on it.I have tried a lot of firmwares Got some signs ( as screen shines) but it never properly worked.I am thinking to buy a new one from there.

HEY you!!! if you wanna buy a new one send your old one to me...

If you want to recover this listen man !!!

YOu have to try many full firmwares and the one which will make you see it in explorer is right ! then you have to find dump !

Look for it by number of its chip