This firmware is for x96 mini tv box with Amlogic s905w as cpu. btw

 X96 Mini 2GB RAM + 16GB ROM TV Box 

Download Android 7.1.2 stock firmware for X96 Mini TV

Firmware details
Archive: X96 MINI  / X96 MINI Android 7.1.2 Amlogic S905W 4K TV BOX Firmware Update 20180512
Model: X96 Mini TV Box
Image file size: 766 MB
Platform: Amlogic S912
Image: X96 MINI.img

Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.

Download Amlogic USB Burning Tool v2.0.8

You can use Amlogic USB Burning Tool to flash firmwares from a Windows PC to Android devices powered by Amlogic processors.

Download Amlogic USB Burning Tool v2.0.8

How to use Amlogic USB Burning Tool

1. Download USB_Burning_Tool_v2.0.8_x86 (7.03 MB).2. Extract the archive and run setup_v2.0.8.exe file to install the tool.3. Start the USB_Burning_Tool.4. Click on File->Import image and select your specific .img firmware for your Amlogic device.5. Make sure that your Amlogic device is powered off, with the USB OTG port connected to your PC. Use a toothpick to press the recovery button, and power the device. The USB burning tool should automatically detect your device.6. Now click on the ‘Start’ button button to proceed with the firmware update which should last several minutes.