[mrpragay]

Thank you for answers!

I repaired it physically first, and then the firmware recovery. The repairing was not too difficult, because i only had to do back the battery, and cables. I think its stable now.

For recovery i used the first fw, wich listed on the "dead players recovery guide". Should i try another ones? This works fine, except this only one, wich sometimes makes me crazy.
Sometimes i can listen to music 3 or more hours without any problems, and sometimes it restarts 3 times on 1 track.
It does not depends on tracks, it can restart on the track, wich for example on repeat.

Now i make a try with scandisk in windows, for look bad sectors. The disk tool, wich was on the player's cd says: "unknown memory" or something like this for each format mode.

I will tell what happend!