Sorry for the lack of pictures. But I can confirm - it is actually B1 revision of the device.
As for the firmware - I have downloaded version you specified in one of your posts (and which is officially the latest version - by dlink.fr) and installed it in the NAS. The result - it turned out that I did downgrade of the firmware...
I used to have (originally uploaded):
07/12/2012
now I have:
04/26/2012
So, it was a downgrade... :-(
Now I can not find the newer version, which I originally had.
BTW, one problem still exists for me - I can not save configuration - configs file has 0 bytes. :-(
(ffp & debian are switched off)