I see you are about to gain access by reflashing. For less adventurous people, have you checked if the acrobat-standard launch of external applications from pdf does work?

Good idea ;)

If you don't know what arivero is referring to, check out this iLiad thread:

http://www.mobileread.com/forums/showthread.php?t=7063

and here:

http://www.mobileread.com/forums/showpost.php?p=32880&postcount=250

Basically specially-prepared PDF files may allow you to run any external application. This worked well to hack an older iLiad firmware.