Rolling back Pioneer 111D

I was not sure where to put this one, sorry. I am having troubles with my Pioneer 111D. I am pretty sure it is because of the firmware I have on.
I upgraded to the dangerous brothers 111L 8.29 hacked firmware and I would really just like to go back to stock 111D 1.29 firmware and I am unsure how to flash my drive back to a stock firmware now. When I try to, it says “Available target is not found.” Please can someone help me find a workaround to this. All the help is greatly appreciated.