I left it alone for a while longer after my post here and it finally finished. Took about 40 minutes after it got to 99%.
I don't know what I was updating. I know it was not a new map or firmware. I plugged my 1530 into my computer and it just started "updating". Nothing indicated what I was updating.
The only automatic update should have been the GPS QuickFix ephemeris files. Sometimes, they'll stay stuck at 99% forever, and need a bit of a kick in the pants. Glad it finished for you (finally).
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