roleoroleo/yi-hack-MStar ? reverse-engineered prompt

Build me the custom firmware for a Yi 1080p camera that uses the MStar chipset, not the Hi3518e one.

I want it to flash from an SD card, boot cleanly, and then give me a simple web page on the camera’s IP address where I can manage the main settings, see motion events, view recordings, and check status. It should include RTSP streaming for high and low quality video, audio support, snapshot URLs, ONVIF support, FTP, SSH, telnet, MQTT events, and online firmware updates. If the camera supports it, include PTZ and presets too.

Please keep it practical for a low power camera, so avoid turning everything on by default if it would slow things down. Also make sure cloud features can be disabled, and keep the install and upgrade flow easy enough that a normal person can follow it. If you need current docs for the camera or build steps, look them up online first.