cl_sayed,
Most of the 3.5.37 firmware on site are for the ATJ2085 chipset, finding the right firmware for the ATJ2051 could be a problem, I know other members where having trouble finding the right ones.
You could try contacting your seller, they may be able to send you a copy.
Also have a look through the Gallery here:
http://www.mympxplayer.org/album.php
and PM other members who have the same player, I think "princessanne1026" has a similar one.