800xA 5.1 / AC800m - Serial Firmware Upgrade tool - stuck on 99%
I'm trying to downgrade the firmware on a PM860 controller by connecting to the COM4 port and using the serial firmware upgrade tool. It seemed to go fine until it got stuck on "Sending file... 99% done." It's been stuck there for a couple of hours. See the attached screenshot.
What do I do? I don't want to brick the controller.