Looking at the magic string "1.7 20120927", I guess your device comes from ArtaTech
a.k.a. "Onyx Europe").
I'm afraid you will need to talk to them directly.
I looked at my device which runs the Mixed Firmware for I62/I62e/I62HD/A62/A62s/M92/M92s ArtaTech devices
, but there is no Greek keyboard either (and that probably means that the Booxtor's firmware
lacks Greek as well).