I've updated to Kindle 3.0 for iPhone (4, iOS 5.0.1) and as many experienced, it broke most of my sideloaded content (all unicode books gone, only English books retained).
I went to remove the version 3.0 and reinstalled version 2.9 but to my horror, now ALL sideloaded content disappeared, even though the mobi books are still in the Documents folder of the app.
I tried to deregister/register, remove/reinstall the Kindle app (version 2.9) many times to no avail.
Now Amazon's released version 3.0.1, I immediately updated it and try to sideload content again, but the app still shows no books in the library.
I don't know what went wrong, but am not keen to restore my iPhone to factory setting to set up everything from the beginning.
Anyone has come across this issue, or has any clue?