Thanks to all! It is somewhat consolating that I shouldn't be alone with my problem. Though this is no solution.
But indeed, it was today that I informed myself better about Koreader and CoolReader for Kobo. Only that it appeared to me a too heavy interference into the internals of my reader as to take the risk of trying - beeing without any clue in programming matters. So, Ken's advice can be a good help for me. I really doubt it it's a hardware problem, but it's also dubious to me if, under this circumstances, Koreader or CoolReader would without problems recognise the SD-card. - Would both run under Fw. 2.5.2?
One thing to do is in fact a reset - work settings or pinhole. I'm just waiting until I finish a book that I'm currently reading on the device. It's a kepub and not so easy to store elsewhere.
Perhaps - that's my last hope - could help the next firmware update.
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