is an older "generic" box with many board variations, finding the exact "high-quality" match is critical. You can often find verified builds on community forums and dedicated firmware repositories:
This article provides a definitive, step-by-step resource. You will learn exactly where to find high-quality MXQ S805 firmware, how to distinguish between hardware revisions, and how to flash it safely.
. Most Lollipop versions for this specific chipset are unofficial "ports" from other devices. Firmware Status & Availability Official OS: officially supported Android 4.4 KitKat
Upgrading to the Lollipop firmware introduces several technical and functional improvements over the stock KitKat version:
: Format a microSD card to FAT32 and copy the firmware files to the root directory. The "Toothpick Method"