Download Android 4.4.2. KitKat stock firmware for Elephone TV Box from here, here or here. Download another firmware from here. Download Rockchip Driver Assistant v4.8 from here and download Rockchip Batch Tool v1.8 from here.
Archive name: K2_RK3188_OV5640_V442_140911B
Image file name: update.img
Firmware size: 294 MB
Model: Elephone TV Box / X88 / i9R TV Box
Platform: Rockchip RK3188 / RK31
Firmware: Android KitKat 4.4.2 stock
Model number: rk3188
FW version: 4.4.02
Boot number: 2.10
SDK version: RK30_ANDROID$(PLATFORM_VERSION)-SDK-v1.00.00 \
Build number: K2_RK3188_Public_V442_140911 / K2_RK3188_Public_V442_140911_elephone / rk3188-eng 4.4.2 KOT49H eng.gouwa.20140910.152246 test-keys
Other: Everything is working just great. The TV Box, the camera, the remote control, WiFi, Bluetooth, all ports…
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.