Make screen capture copies of the config pages in a separate file for use after updating so you don't loose what you did. Same for any scripts, etc.
Cleanest, known state, cleared memory, starting point that avoids issues is to factory reset and manually configure after firmware upgrade. Always
You can try a dirty upgrade and see if any immediate issues occur. Some do this without any issue. But , if you start having issues, start with a factory reset and basic config to aid with trouble shooting.