Matrix MX4 won't flash/work in PS2 V4, please help

Hi,

I've tried an Duo 3 Gold in a PS2 V4, but it didn't work.
Then I soldered in an Matrix MX4.
I put in a CD-RW with the firmware, but it just won't flash.
Every time it just starts with the PS logo, and the browser offcourse? doesn't recognize the disc :(

What could be the problem?
Which wires should I check?

Just tried an cd-r with the flash, and held the reset button a little longer.
I now get to the "press start to flash or X to erase" screen.
It just won't flash or erase...."please wait"...

any ideas?

Do you have a pic of the chip? It could possibly be a clone. Also are you using the Matrix MX4 upgrade or the Matrix Infinity upgrade?

i doubt its clone ..as gamecubesuxs post a pic of your modchip ..if its green dot ..then its not clone ..