How t to recover lost data on Behringer Wing

Good afternoon friends. I'm Leonardo. I got a Behringer Wing and I had a problem updating the firmware.
While I was trying to update through my iMac, there was a power outage. now i can't access the console data. so I can not enter . I try to connect with my usb connected to the iMac holding the selection button next to Screen, open two partitions on the computer and put a current firmware and even then, it doesn't restart. I continue with the machine without data. How can I solve this problem. I live in Angola and there is no store for me to go to. Help me friends and sorry for my english mistakes.
the screen does not light up