XCTechs Files Page You Can Find your Box Firmware here
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Download Android KitKat 4.4.2 stock firmware for MyGica ATV585 TV Box from here.
Firmware details
Model：ATV5850
Image file size: 454.2 MB
Platform: Amlogic: S805
Note: Due to hardware limitation, this unit and chipset can not handle OS 5.1
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
