Thanks a lot! Before your post here I already started writing the dump from the existing sd cards to my new sd cards.
Afterwards I put the update.zip from the Tolino website onto the partition that was labeled "media_data" where an existing update.zip resided, which I overrode. Afterwards I started the recovery and selected the recover option which went through without problems (while the original update.zip on the partition failed) and then the ereader worked perfectly fine afterwards with the new sd card!
Today another defective Tolino Vision 6 (with a +6B2 motherboard) arrived and I just now did the same procedure and it worked just fine as well!
So I both recovered them from crashing System UI apps by just replacing the sd card and replacing the update.zip in the "media_data" partition, I'll later test the sd cards with f3, if they appear to be working I'm guessing that the previous owners updated the device with an empty battery and bricked the device this way.
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