Download latest KitKat 4.4.2 stock firmware for Rikomagic MK80 TV Box from here or here. Download another Rikomagic firmware from here.
Archive: MK80FW_141219
Image: RKM-A80-4.4-6335-20141219_V1.img
Model: Rikomagic MK80 TV Box
Image file size: 301 MB
Platform: Allwinner A80
FW version: RKM_MK80_4.4.2-a80-v2.0rc3
Build number: MK80-eng 4.4.2 KOT49H 20141219 test-keys
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