Bricked Omnia. How is it even possible, and how should one proceed in such a situation?

Little too fast. Of course you’ll always find the answer right after posting your question.

First reset uBoot (removing the OpenWRT customizations) with:
env default -a
saveenv

Afterwards the recovery (4 LED method) is working again because the addresses point to the rescue kernel now.

I am still curious how to flash OpenWRT…

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