Download latest Android KitKat 4.4.2 stock firmware for Nagrace HPH NT-V6 TV Box from here or from here. You can download previous firmware version from here.
Firmware details
Archive: OTA_TRN6A_HPH-FO-N6_RK3288_4.4.2_EN_US_FT0_V1.4.5_150305
Model: Nagrace HPH NT-V6
Image file size: 1,5 GB
Platform: Rockchip RK3288
Build number: rk3288-eng 4.4.2 KOT49H eng.liangkd.20150305.162618 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.
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