If 3rd party software makes your iLiad unusable, you're not covered by the warranty if you're unable to reflash it successfully and have to return it to iRex for the operating system to be restored.
This is unlikely, but its possible. See:
https://www.mobileread.com/forums/sho...d.php?p=337695.
You'd still be covered by iRex's 12 month hardware warranty for a new iLiad if you load 3rd party software.
I read novels/pdfs/textbooks on my iLiad. For a list of formats supported, see The famous eBook Reader Matrix in our wiki at:
https://wiki.mobileread.com/wiki/E-book_Reader_Matrix