Download Marshmallow 6.0.1 stock firmware for K99 R-TV Box
This firmware is for K99 R-TV Box with Rockchip RK3399 as CPU. BTW, you can now buy K99 R-TV Box from Geekbuying.com for only $139.99 with free shipping world wide.
Download Marshmallow 6.0.1 stock firmware for K99 R-TV Box from here, here or here.
Download Rockchip Driver Assistant v4.4 from here and download Rockchip Batch Tool v1.8 from here.
Firmware details
Archive: R-TV BOX K99_RK3399_wifi6255_6.0_20170302
Model: K99 R-TV Box
Image file size: 632 MB
Platform: Rockchip RK3399 / RK330C
Image name: R-TV BOX K99_RK3399_wifi6255_6.0_20170302.img
SDK version: RK30_ANDROID6.0.1-SDK-v1.00.00
FW version: 6.0.01
Boot version: 1.05
Model number: rk3399-box
Company: Android
Build number: rk3399_box-userdebug 6.0.1 MXC89L user.hotack.20170215.110100 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.