Window reset for 5th gen is easy, just roll each window all the way down, holding the switch down for another 5 seconds or so after window is down, then roll the window back up, holding the switch again for another 5ish seconds after the window is up. Repeat for each window, and done.
I don't bother with a battery saver either, just swapped the new batter in, reset the windows and the couple options in the menus that changed, and was all done in less than 5 minutes (windows included). Didn't need to re-pair phone or anything like that.
