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UM3 Firmware update hang up

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I began the firmware update for my UM3 but we lost network connection for a while and now the printer is hung up at "updating motion controller"  and has been there for a couple of hours. Can I turn the machine off and try again? Any help going forward would be much appreciated I don't want to brick this thing.

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This is positive as the motion controller is the last component being updated and it means all other parts have succeeded. Rebooting the machine shouldn't be a problem as it will check the motion controller to have the most recent version at every boot and update then when necessary.

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