Go to your phone's WiFi settings. If you see "WiFi_Car_DVR_XXXX" with a "Failed to connect" message, tap the (i) or gear icon and select "Forget This Network."

The default Wi-Fi password for the 168 Car DVR (and many generic or "OEM-style" dash cams using similar hardware) is typically 4stinger.sk Quick Connection Guide SSID (Wi-Fi Name):