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					Originally Posted by  dwanthny
					 
				 
				You need to use device_db for this to work.  
  
			
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 It finally worked! 
Turns out I needed to update Calibre to the most recent version...

I was still using version (something like) 0.8.13.
With that older version of Calibre, I couldn't combine the format 'device_db' with device 'PRS505'. 
Calibre kept coming up with an error-message: The chosen format wasn't supported by the device. So I used 'epub' as format, since all my ebooks are epubs.
After updating to 0.8.21, I'm able to combine 'device_db' with 'PRS505' and everything turns out exactly as I would like it to be.
Thank you very much for your help!