I have downloaded firmware today.
I have no issues with Calibre, but for comunication I have original firmware active.
Problems I have with formats, I think the firmware do not know codepage of text.
For me (Czech) is:
DOC - OK
RTF - combination with azbuka (1256 ?)
PDB - combination with azbuka
PDF - OK
Our special "ěščřžýáíé" are as Russian.
Another problem is RAR and ZIP, no file is open (I have many in archive), it is go back to main menu, but ZIP as example in firmware package is OK.
I hope I can pack DOC etc. in RAR ?