Bonjour my friends. I also own a Alfawise U30 Pro build by Tronho3D. I recently tried to update the old, and now as I know, custom Marlin firmware and bricked it. After a short conversation with the people over at Tronhoo I got the firmware to restore the U30 Pro. Here they are. I used the one with the bootloader and now it runs again like before.
Greetings from your neighbour in Germany
Schlotterp
U30.hex
U30_with_bootloader.hex