This from Icarus, I'm not convinced!
Download the Adobe Digital Editions software and install it. When you install adobe digital editions ( ADE ) for the first time , you will be required to authorise your pc for once with your Adobe ID. You can create an Adobe ID via www.adobe.com
After you have created the adobe ID, you will connect your ereader with your pc, and authorise with your same Adobe ID. For most of the ereaders ADE will detect your ereader as soon as you connect your ereader when turned on. You will be requested to authorise.
When you have followed all steps ( just 1 time) you can download and transfer e-books to your ereader via ADE.
Remember : The acms files which you receive when you click the download link can not just be saved to your pc, you will need to open them in ADE, because only then your secured book will be in epub format, after this you can transfer your book to your ereader and you will be able to read it.
I did a factory reset via the android settings, which looks just the same as the Icarus reset, without ticking the delete everything box, and lo and behold my books showed up with their covers! I'm now starting to think that it may have come from one of the apps that I had installed. I will reinstall them over the next couple of days to see if that is the case