Hello Domas,
As you found, I have reloaded my Cybook Gen3, which is also based on the Netronix EB100 I think. I'm not sure if the operating system is the same, but you can try my path to see if it helps. THere is a serial port, but it is at 3.3 volts. You will need a 3.3V to RS-232 level translator. THis is a single chip and you can usually buy a little board with one one it. It is powered from the ebook board. With that, you can look at the bootloader stuff, and maybe find out what is wrong. I didn't try the JTAG port yet. THe pinout for both these connectors can be found on the Bookeen forums.
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