Hold the button down, plug in the power, and keep holding until you see the Android "Upgrading" screen.
Updating to Android 5.1 usually requires a custom recovery like . mxq s805 firmware 51 download link
: Format a Micro SD card to FAT32 and copy the firmware files to the root directory. Hold the button down, plug in the power,
: You can find various S805 ROMs, including Android 5.1 builds, on AndroidFileHost's MXQ Amlogic section 4PDA Community Hold the button down
with different internal boards. Firmware intended for one version may not work on another, potentially causing Wi-Fi failure or bricking .
represented a significant "end-of-life" upgrade, offering better app compatibility and a more modern interface before the hardware became obsolete. The Search for Firmware 5.1