XO1.75

[Yioryos Asprobounitis]

Hi list
I dug out my XOs to check their condition and my XO-1.75 (SKU203) refuses to boot as if it was wiped out clean or has no microSD card at all.
The screen comes up and nothing further.
Firmware check just show a double zero [00] 
Trying to install a fresh OS from USB fails (with the same double zero)
A fast wiki search did not come up with anything relevant.
If someone can point me to the right direction I would appreciate it.
Thanks