Download Android Nougat 7.1.1 stock firmware PC version for MECOOL KIII Pro TV Box from here, here or here. Download Android Nougat 7.1.1 stock firmware SD card version for MECOOL KIII Pro TV Box from here, here or here. Download previous firmware from here. Download Android 6.0 stock firmware for KIII Pro TV Box from here. Download Amlogic USB Burning Tool v2.0.8 from here or download Amlogic Burn_Card_Maker v2.0.2 from here.
Archive: KIII_PRO_AVL6862-NHG47L-20170905.174619.V0619 / KIII_PRO_AVL6862-ota-20170905.174619.V0619
Model: Mecool KIII Pro 3GB/16GB TV Box
Image file size: 778 MB / 857 MB
Platform: Amlogic S912
Build number: Amlogic/q20x/q20x:7.1.1/NHG47L/20170905.174619.V0619:userdebug
Other: Supporting DVB-S2
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.