The old jetBook firmware is still available if you change the filename on the download. Sadly, the Aluratek firmware is not. I haven't been successful recovering the deleted file.
Toz, can you access the self-test screen? (Push the reset button on the back and then hold the power button, Menu button, and zoom buttons simultaneously). If so, and you're feeling brave, you can use the Ectaco firmware to reflash the bootloader and format the internal memory. Let me know if you want to try it...