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.

serialfirmwarefcc.PNG

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janedoe89 Rank: 961

Asked 2 years ago

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Try with 9600 baud rate

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Basappa G Rank: 44

Answered 2 years ago

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I've had such a situation once. It was caused by the com port on the PC somehow not working correctly. You could upgrade the firmware with a compact flash card + card reader. This works normaly also if the flashing has gone wrong.

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