A green "M" will appear, or the Factory OSD (On-Screen Display) menu will open. Hardware Debugging Tools
For Hisense TVs using the proprietary operating system, a specific browser-based workaround historically allowed users to install custom HTML5 apps. hisensedebug
If you’re looking to push your Hisense Smart TV beyond its stock app store, the hisense:debug command is your secret "backdoor" to the VIDAA operating system. This hidden feature allows you to sideload web-based applications, like Jellyfin or custom media players, directly onto your screen. What is hisense:debug? A green "M" will appear, or the Factory