I tried to update the firmware and I guess I did it wrong, Electra one went crazy

Hello,
I tried to update the firmware and I guess I did it wrong, Electra one went crazy.
The screen display is not working properly, and when I put it in USB DISK mode, it recognizes ELECTRA, but all the folders are gone.
How can I get back to normal?

Hi, I have just sent you a PM to look at it with you.