I want to upgrade firmware v4.1 to v5.1 of a PM856 Controller, It hang on at 99%.
Can any body tell me is it possible or not .
I have attached a snap of it.
I think PM856 can run 5.1 - to be sure, take a look in the 5.1 release notes.
Sometimes a certain FPGA or hardware revision is required. This is also stated in the release notes.
Before contacting your regional ABB support center; try making the controller totally out of power (=remove internal & external battery feed), then cold start the controller and make one more attempt with serial upgrade.