Thanks for your support!
Yesterday, I left it on (blue led on) and the battery completely drained.
Today, I again tried to flash update-20120309.zip, and now at least I get a message on the screen "No update found, booting device...", after which there is no activity (I left it alone for 20 minutes).
(This message occurs a few minutes after boot; first the screen flashes half of the logo, then I see a few random flashes of the entire screen, and then several minutes of no screen activity).
To rule out a bad sd-card, I tried it with another card; same result. The cards read fine in two other computers.
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