Press the button repeatedly until you reach the Settings (gear icon) menu.

If you have contacted APEMAN support and they have sent you a file, here is the standard procedure for the A77.

This is common in the dash cam industry. Manufacturers often cycle through models quickly, and legacy support is minimal. While APEMAN used to host files on their site or Google Drive links shared by customer support, those links frequently expire or lead to generic files that may not match your specific hardware revision.