That sounds like a corrupted firmware module. If it is and is up to date Package may not replace it. Try individual firmware modules. Most likely the scanner firmware. Check the firmware history to see if there are any other modules that the scanner version you are loading requires.
As for remote update, in addition to the risk of the machine have its power shut off that marvin-vegan mentioned, there is also the risk an incoming fax, a print job or some other network activity causing the update to fail.
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