I used the Mac, showing the iPhone in Finder and selecting alt-restore to select the ispw.
Had around 1GB available today…
Does it still seem to be indexing or is it still kinda warm/hot? If it’s cool, it’s probably finished, I’d say to reboot it then. Indexing may be taking a long time, too, due to the lack of free space.
How much free space did you have before trying to update, just curious?