By hiding apps that scrape copyrighted content (e.g., Yoyo ), the manufacturer (Shenzhen EV Technology) can argue that the device is merely a "neutral hardware platform." The hidden menu acts as a "click-wrap" barrier, shifting liability to the user who actively chooses to reveal and use the unauthorized apps.
Depending on the manufacturing batch and the last firmware update (Over-The-Air update), different codes may be required. If "888" does not work, try the following: Evpad 6p Hidden Apps