Download latest KitKat 4.4.2 stock firmware for Eny EM8 TV Box from here or here. To flash firmware on this box from SD card read this article.
Archive: ENY_Em8_ap6330_8g2g_141208_sd升级_xbmc14
Model: Eny M8 TV Box
Image file size: 349 MB
Platform: Amlogic S802 quad core
Update file name: k200-ota-20141208.zip
Build number: k200-user 4.4.2 KOT49H 20141208 test-keys
Update file name: k200-ota-20141208.zip
Build number: k200-user 4.4.2 KOT49H 20141208 test-keys