Thank you Tadad1.
I tried all of them. I've contact the supplier of my mp4 player, he cant help, checked the mini cd, search with google (found some but didn't work). I found one but this one is getting the blue screen flashing and activates the mp4 player if a usb storage disk. I think this is a step in to the right direction? Because all other programs showed only a blue screen. Its the firmware called: hy875c. I tried it in combination with 14 dump files, with no succes. So if somebody reads this and using the hy875c firmware and got a dump files working with it, mail me please. Otherwise i have to wait on my other found sollution (i ordered the same nano look again and it will arrive about 1 month).
Some other questions:
Is it important to use a firmware from a 512mb on a simulair 512mb mp4 player or can you also use a simulair mp4player 1gb firmware instead?
After formatting your mp4player, what kind of screen you have to see. Is it the sand glass in screen or just a flashing blue screen (loading) is a good sign. This was not very clear in you description to recover a dead mp4player.
Thank you for all your help. Ofcourse wenn i fix my one i will also post the firmware here.
ops: