Quote:
Originally Posted by book64
I have 2 old kindles 2011. But the Internet connection has stopped working on them.
I can add books i have already and read on the kindle still.
Been using transfer by USB and adding books to calibre, hich has worked very well.
However during the past few days I have found that some ebooks will convert no problem
But others say drm.
If I keep trying and download maybe 3 copies eventually it will work.
I can't figure out why, don't seem to have done anything different 
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What version of calibre are you running? Calibre 5 breaks the DeDRM plugin. Are you always using the same Kindle serial number for your download or have you entered the serial numbers for both your Kindles in calibre? Download and transfer via USB locks the downloaded book to the serial number of the Kindle you specify in the download.