Uuuuuf!!!, I've done it!!, Just backup the whole filesystem, and format the unit.
Then, just for testing purpoues..., I've swiched it on, and saw that it recreated the folder structure, and reinitilized the configuration (chose again language, etc).
After that, I've uploaded to the device only the fonts and the ebooks..., and after that.....
, it seemed to freeze on load process (with the second image)....
, but after some minutes, it finally worked!!!!
YUUJUUUUU!!!
THAAAANKS A LOT TO ALL OF YOU!!!