@NiLuJe: thanks for the info and for the link! I wasn't talking about screenshots, actually, but about what I was seeing in the Device tab in Calibre when my Kobo was connected to my computer. All the books uploaded on the device/downloaded from the Kobo server after I updated to this firmware version (the latest before the Forma releases, definitely more recent than 4.2) show a BGR cover, as you described. It might be a change in how the device communicates with Calibre, then? I'll try taking screenshots later and see what is actually on the device, as I obviously can't see any difference on the screen.
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