firmware MP4 player model 705CF+
 

I'm looking for a long time correctly working firmware for my MP4 705CF+ model. It's based on ATJ2085 board processor. I tried a lot of smililiar firmwares (theoretically dedicated to this model) from a different sources, but all of them don't work correctly. Sometimes after upgrade process there's only a blue screen and player not responding, sometimes it's totally dead and not respoding at all. Maybe on this portal I'll find some answers on my question.
If someone have the same model of MP4 player as mine, maybe give me some advices or this person that be so kind and send me some original firmware I'll be very happy and grateful.Thank You all for a forbearance.