How do I factory reset an OBD2 ELM327 device (not reset ECU)?

it no longer puts out wifi thank you

tried turnning it off for a day, it has no reset button on the unit or PCB

here is more information: Here is more information https://security.stackexchange.com/questions/245951/wi-fi-station-wont-connect-to-ap-wpa2-psk