Looking around and trying different thigs, i came to conclusion that it is not trivial to get aluretek libre to run jetbook firmware, if the libre is already running a recent version of its firmware. While I have not read this anywhere explicitly, my understanding is that before you could just reflash libre with jetbook firmware, but recent versions of libre firmware prevent using jetbook and other firmwares on the device -- I just get an error message (after I press OK key to approve firmware) that correct firmware is not available on the sd card.
Maybe they cnaged encryption key or something like that ..
Also I found a thread here where it is described how to decrypt the .bin firmware file for the jetbook, but I don't think this will work for Libre (Libre's firmware is the .bin file only, ot does not come with any mtd files).
I tried downgrading to older versions of libre firmware with the hope that it will allow me to eventually install jetbook fw, but i couldnt find old firmwares.. my libre came with fw v 0.15k , and i did find links to 0.15h and 0.15e on this forum, tried both of them, but with no success. I think i would need something older, perhaps v0.14
I'll hack at it some more tonight, and if I don't fix or brick it, I'll return it to the store and will get a real jetbook instead.
If anyone has any tips, please share them
Thanks.