alkap

In that case I’m afraid your box suffers a hardware issue. 

that's what i'm afraid too .  .

maybe you did not understand, the recovery goes very well,

but when i restart multibox, recovery or fastboot erases itself from emmc memory.

and it gives this error  " check boot area failed "    

maybe it's an SDRAM problem 

I just found the time to flash the Multibox with a new 8.1 release and the last Nightly Build. I also flashed the latest recovery image via the recovery menu. As far as I've noticed the recovery image hasn't been changed since a long time. If this isn't needed why should it be changed.

As you can see on the picture, all images are still present and working. Can you starup with the recovery image? Obviously not. Maybee some wierd thing with your USB stick?

I think I need to inject the NVRAM files to it 

always the same problem , " check boot area failed "

If I have the time I will try to test it too.

thank you so much