Originally Posted by steinarb
I tried this now, and the zip file was restructured compared to the original: all HTML files were on the same level. So I hopefully tried a new zip->epub conversion.
But the resulting ePub still fails to open on the PRS-T1. It just exits back to the menu, showing this ePub as the most recently read document.
Validae the EPUB with Flightcrew or at http://validator.w3.org/
This should indicate if it is malformed (but not oversized segments)