Antwort auf: Wiederhergestellte Ledger-Wallet – Zugriff auf einige Assets nicht möglich
Incidentally, here is what ledger says to do about the „MCU not genuine“ message.
https://support.ledger.com/hc/en-us/articles/4405497803153-MCU-firmware-is-not-genuine?support=true
Idk I’d you tried this, but maybe getting the old device (if you still have it) working through these steps will free up your ETH if you still are having trouble accessing it on the new device.