All you need to do is download the 13.5.1 IPSW and then use iTunes or a 3rd party tool (I use iMazing) to simply overwrite the newer OS. I did this to get my iPad back from Beta 1 to 13.5. All my apps, password data, setups for Banking apps etc and touch-ID were retained.
This wouldn’t work between major releases but it’s fine between point releases.
ahh good to know! Had no idea it could be done.Did you have any issues likebad Battery life or resprings after doing it?