Hello,
I'm having problems reading files in RTF format: the files are opened correctly (albeit a lot more slowly that EPUB) but sometimes happens that they are truncated that is I cannot read the book until the end
I've tried to convert these file in EPUB with Calibre but strangely the problem remains the same
File that are natively EPUB are instead read without problems.
I've firmware release 3.12.1 that I suppose is the last firmware...
Do you have this problem too? The alternative readers as CoolReader are no good for normal use IMHO because they do not give battery empty indication and worst after recharge they lose all their settings (at least these was the behavior on the old Kobo Aura HD that I destroyed after this happened again

)