Download latest Android KitKat 4.4.2 stock firmware for Enybox EM9 TV Box from here or from here. Flash this firmware using this video tutorial.
Download SD card firmware version from here or from here. Flash it using this video tutorial.
Archive name: Em9_ap6330_2g8g_150203_usb / Em9_ap6330_2g8g_150203_sd
Image: aml_upgrade_package.img / n200-ota-20150203.zip
Archive file size: 253 MB / 382 MB
Platform: Amlogic S812
Model: Enybox EM9 TV Box 2GB RAM + 8GB ROM with AP6330 WiFi module
Build number: n200-user 4.4.2 KOT49H 20150203 test-keys
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.