Hello,
To upgrade your ufs to firmware 2.8 do the following:
1. Download this soft: Here
2. Install it.
3. After install plug your ufs device.
4. Start program
5. At the left top select your ufs device and click connect
6. An automatic prompt ask you if you want to upgrade your firmware
7. Confirm it.
After this you can use your box with BB5King soft.