How can I do a factory reset or erase data?

For S series following steps:
   Car Settings-Factory-225588-ok. Erase user data.
   Car Settings-Factory-22558800-ok. Erase all data including factory settings.

For HC series following steps:
   Settings-Car Settings-Factory-000000 ok-Erase all data (factory reset)-ok
 

Turn on WIFI Automatically