Quote:
	
	
		
			
				
					Originally Posted by  Uschiekid
					 
				 
				As others have mentioned, some formats can be problematic.  It might help if you give us a list of the 11 formats you have, and people can give advice for which ones won't work well (or at all) and the best way to convert to a better format. 
 
For finding which "firmware", I switched mine to French to find what its called to make it easier for you: 
Paramètres→Informations techniques→(Informations sur le logiciel) Version:  
 
ie mine Kobo Glo is currently on 4.19.14123 (bf36b8c11a, 10/12/2019).  The important bit is 4.19.14123. 
			
		 | 
	
	
 You should upgrade it to the 4.21.x firmware. The new series feature is very useful.