Thanks for answering!!! The chip is an ATJ2085H.
Is very hard to find 3.5.xx firmwares for MP3 players, all that I've seen are for MP4 players
I'll keep searching! if you have any firmware that may work please upload it!!!
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GOOD NEWS! I've found a full firmware that worked.. Now the player is recognized as an USB storage device
The bad new is that is recognized with 521mb :shock: It used to be a 1gb player. Is it posible that the memory is broken?
Also I've found in the recovery process that the memory is not very good "soldered" or "attached" and I had to put some presure on it to make it work
I'll see if I can resolder it, but it's a very hard work :x