HP PageWider P77740Z motherboard firmware or replacement candidates?

[Dovis]

Hello,

I have HP PageWide Managed MFP P77740z. (MB part number: A7W93-80153-A, A7W93-60153, (AKL570800389 REV. A))

I believe, it has faulty motherboard - turns on, is trying to load progress bar and shows blue error 8b380001. I can't detect it under network (LAN) or with USB.

What issue it can have?

I believe, it is a firmware issue. Maybe someone could help to reflash the firmware? 

Or maybe someone could confirm that motherboard from machine like P77750Z / P77760Z (Motherboard part number: A7W93-67084 A7W93-80153X10) would work with my machine? I saw to buy P77750Z refurbished. Wondering if it will fit to my printer. The motherboards looks the same in pictures...

I can't event find the difference between P77740z and P77750Z.

Thank you for your answers. 

Regards.

[Valsimot]

The mainboards are probably the same, the important part is in the firmware on emmc disc that differences models and their print speed.

[Dovis]

I understand. What error code 8b380001 means? I hope my emmc is not broken.