For those who have updated (e.g. me) and do not see any problem (I have only read kepubs ...), is it worth to roll back to previous FW?.
It seems strange that all new FW have been retired when only some models are declaring problems.
I have installed the patch for the fonts in epubs, and perhaps this is the reason why I have no problems... (yet).
I have been waiting for so long a new FW solving the stats issue that now I do not want to revert

Syncing should be safe, or will it try to revert?