Kai Bor K3 Brush tutorial [detailed graphic explanation]
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First, need to be prepared before the brush
1. A USB data cable for common Android phones
2. One computer
3. One thing that resembles a fine needle (such as a small toothpick)
4. Download the Flash Toolkit RK3188. After decompression, there are two folders, a USB driver and a Brush tool.
Brush Toolkit: http://pan.baidu.com/s/1iT1Cm
Second, brush method
1. First turn off the A8's power, use a MICRO USB cable, which is a common mobile phone USB cable to access the A8 rear OTG port, and the other end into the computer USB port. Hold down the RESET hole next to the A8 optical fiber connector with a pointed object such as a toothpick, and then turn on the power. After about ten seconds, the computer will pop up a new device and follow the prompts to install it from the specified local location. Select the USB driver corresponding to the just-downloaded accessory. Driver folder x86 is 32-bit, x64 is 64-bit system)
Note: It is recommended to install software such as pea pod or 360 mobile assistant on the computer. The system will automatically install the required driver.
2. After the driver is installed, open the RKBatchTool.exe inside the Brush Tool. 
3. Open the Brush Tool and click the button in the upper right corner to select the location of the firmware IMG file, and then click Upgrade! The box in the lower left corner of the picture should be green. If it is not green, please re-plug the computer USB again or repeat the operation before holding down the RESET button. 
4. At this point, the flashing of the block begins to flash, waiting for a while to complete. If the brush fails, it doesn't matter. You can do it again. 
Note: After the brush machine is successful, do not try to unplug the device first. Wait a moment for the box to automatically clean the upgrade file and restart it. Unplug it after two or three minutes.
Precautions:
1. When the flashing machine does not allow the existence of a file other than the firmware of the flash drive
2, first unplug the power and then insert the U disk to the set-top box, this time hold down the rst hole plug in the power supply (many users do not do this step correctly so no press brush for a long time screen)
3, if the above methods are operating correctly and there is no brush screen please change a USB interface, or change U disk to retry