Think I found what you need to do.
You’ll have to try it yourself. Not going to mess with mine.
Enter developer mode:
Here is the routine to open dev mode: Go Settings → About → Tap the image on top for 5 times to activate dev mode (Tap once more to inactivate dev mode). The option to disable fast calibration sits inside “Experiment” app.
You should then see an icon for “factory”. Should be able to do a full reset. Maybe there’s some wifi settings in there too.
If you do factory reset I assume you’d need to redo your extruder calibration (at least check) or any other settings you’ve done.
-S