After the update, I noticed that my device is noticeably faster globally (BOOX Onyx Leaf 2), both in the GUI and when reading in the settings, where changing the font size, weight, dictionaries react almost immediately. Anyway, I will see after some time if this reactivity will be the same. I was very pleased with the update, I like the new look even more than before.
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If you have experience with EDL and have plenty of space on your desktop you can make a full, raw backup. That way you can effortlessly return to how it was.
That is a good reminder, but my experience is not so good and I am worried that I would damage the device.