Download latest Android KitKat 4.4.2 111k4 stock firmware for Tronsmart R28 TV Box from here or from here. Download another firmware version from here or here. Download previous version from here.
Firmware: Tronsmart Orion R28_111k4_20150115
Model: Tronsmart R28 TV Box
Archive size: 414 MB
Image file name: Tronsmart Orion R28_111k4_20150115.img
Platform: Rockchip RK3288
Boot version: 2.15
FW Version: 4.4.02
Changelog
1.Support ext4 format U disk and exfat sd card
2.wifi AP6335 perameters adjustment
3.Optimize USB camera
4.Upgrade skype verison
5.Add usb storage device infomation in Settings
6.Optimize RK Vedio player
7.Fix the incompatible problem of some apps in Google Play
8.Fix some 4K H.265 problem
9.Fix some screenshot bugs
10.Update bule ray library
11.HDMI to support cec
12.Open the ip multicast and nfs
13.Otg interface self-adaption to be host or device
14.Browser mode change to android
15.WiFidisplay support
16.New xbmc version,support hdmi passthough better