[pgfiore]

Ciao a tutti
I sometimes face a weird issue with Calibre and my Amzon devices (a base Kindle and a pw).
I transfer a mobi ebook to them but when I try to read it, kindle fires "The selected item could not be opened. If you purchased this item from Amazon... delete and redownload...".

It does not happen always
The input ebook could be very different; Amazon, epub, doc
I use Calibre to de-drm and convert if needed.
All of them are updated to latest firmware, release.
It happens only for mobi; azw3 works (I use it as a workaround)
Calibre and K4PC can always open it.

Here enclosed an example (650kb); mobi from kindle which cannot open.

looking for any help. thank in advance
ciao
pf