Download latest Android 7.1 stock firmware for H96 Pro H3 TV Dongle from here or here. Download previous firmware from here. Download Amlogic USB Burning Tool v2.0.8 from here or download Amlogic Burn_Card_Maker v2.0.2 from here.
Archive: H96 PRO H3
Model: H96 Pro H3 2GB/16GB S905X TV Dongle
Image file size: 1.32 GB
Platform: Amlogic S905X
Image name: s905x.H96_PRO_Dongle_2G(16)_HS2734A_7.1.2018.06.08.15.39.img / H96_PRO_Dongle_2G(16)_HS2734A_720_7.1.2018.06.22.10.25.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.