DEAD Onda 787v3 can't turn in USB recovery mode Help

[Da_fixer]

Hi Last time i want to upgrade my Onda 787v3 (3.7) pmp player whit the 3.8 frimware but when the upgrade is al must done, I get a error After that my player is dead :cry:

I have opened the player to do the "USB recovery mode" trick. But whit no luck :x

What do i worng?

Some player info:
Rockchip RK2706
Samsung K9HCG08U1M
Hynix HY57V281620ETP-6