Hello Kai,
Sorry to hear you had problems while updating the firmware.
The instructions of @gr5 should help you get your UM3 unbricked.
But to satisfy our curiosity, do you remember from which version you were trying to upgrade?
I'd assume you wanted to upgrade to the stable version?
I hope you can answer those questions for me.
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gr5 2,224
Yes. You need a microsd card. But yes.
https://ultimaker.com/en/community/51752-recovering-a-bricked-um3
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