For some reason, the tablet remained dark, i.e. it can no longer be started, and the start-up volume button command does not work either.
I have already read that after the update to Android 12 the tablet no longer starts.

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Nothing works for me either 🤬

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My Nokia tablet had the same problem. After charging the battery, everything stayed dark. I removed the tablet from the case and pressed the power-on button directly. To my surprise, it worked again.

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Update to version 12 all good, no problems. I'm in Asia at the moment.

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Question on my part : has anyone received Android 12 on the T20 in Switzerland yet ? my patch status is March'22 ....

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here is a link .....

https://androidbiits.com/fastboot-mode-nokia-t20-ta-1392-ta-1397-ta-1394-easily/

needs some trained fingers, but should help ;-)

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Question about Nokia T20

For some reason, the tablet remained dark, i.e. it can no longer be started, and the start-up volume button command does not work either. I have already read that after the update to Android 12 the tablet no longer starts.