I have found some ROMs for Amlogic S905D, the same motherboard as our GTC.
Android TV 7.1.2:
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http://freaktab.com/forum/tv-player-support/amlogic-based-tv-players/s905x/others-aml-s905x/firmware-roms-tools-bx/653864-rom-mecool-ki-pro-s905d-ddr4-dtv-android-7-1-1-scv2-not-supported-anymore
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https://androidtvbox.eu/new-firmware-mecool-kii-pro-amlogic-s905d-20171127-release/