If you are running the Python Interval program there are a couple of ways to reset the password.
1. You can edit the file /OSPi/data/sd.json which is just a text file. Find the part that says “pwd”: “abunchofrandomcharacters”, and replace the contents of the second quotes with “b3BlbmRvb3I=”. This will reset the password to the default of “opendoor”.
2. You can rename or delete the sd.json file and reboot the Pi. This will generate a new sd.json file with all default settings. You will need to re-set things like time zone, number of expansion boards, etc but your irrigation programs and station names will not be affected.