Hey Sandman,
I did some search on your website here and I found this:
I did the update before and had the black screen which i kept changing versions because i thought they didnt work. But, all i had to do was update to the file you posted on that thread and then remove the negative battery terminal for 30 min. Turned the car back on and it works, its 4” display with 3.4.22251.
Thank you so much!