Help 2 DIN GPS Multimedea wince

Hello!
I have a 2 DIN all-in-one car audio system.
which is now broken, gets stuck in (boot) image, "more screen saver"
I turn on the gps radio and only show screen saver (reversing camera is working I can see image)
With the following characteristics:

Hardware:

Model Name:J-8611M


Screen:7 inch Hannstar digital touch screen
Resolution: 800*480
CPU Main Chip: MTK3360
CPU Main Frequency: 800MHz
RAM(Memory): DDR2 256M
Flash: 128M
Radio chip: SI4730
Built-in Amplifier: ST(semiconductor)TDA7388
DVD Bald: HOP-1200W(hitachi)

SOFTWER:

MCU:V1.22
OS:V.YC002.200001.121208
APP:TP6731-V01-13-26-90
PLATFORM:Wince6.0-MTK

I have the original ROM given by the seller, which is made of 3 parts!
I tried to install the system
The problem is I can not boot the system. seems that the GPS slot (micro SD) does not work!

any help is greatly appreciated