The firmware is typically distributed as a rather than an official OTA update. You can find download links and community-verified files on platforms like Google Drive or dedicated forums like 4PDA . Installation Methods:
: Ensure your device uses the Amlogic S805 processor. This firmware is typically designed for "all black" HD18Q models or clones. It is not compatible with S905 (MXQ Pro) or 512MB RAM (M21D) versions. Mxq Amlogic S805 Android 5.1.1 Lollipop Download