There is still one solution if you can borrow an iLiad with developer's package installed.
Read this post:
https://www.mobileread.com/forums/showthread.php?t=28055
Copy registry.xml from the borrowed iLiad and reflash-from-CF, then you have a clean FW with developer's package installed in you iLiad. If you want mobipocket reader, copy everything under "/home" to your iLiad. Some Linux experience is required if you want to try.