Thanks @piero.
I know this dialog, but I was in the recovery, that does not display it, as far as I know.
I had swiped the data, cache and system (following the documentation).
adb devices was displaying “unauthorized”.
Have you enabled sideloading in the recovery ? If you’re using /e/ recovery, you should see some command lines at the bottom left corner. Look for some info there when you start sideloading.
Yes, I had chosen “adb sideload” (or similar label) in /e/ recovery, and saw the console lines in the bottom left. I don’t remember any error message there.
I can’t swear because I don’t have the device in hands any more, and used the SD-card workaround.
So did the workaround work?
Yes, flashing from the SD-card worked for me. It allowed me to workaround the issue, and install /e/OS 2.9 on the device
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