3. Using bootup sd disk made by SDDiskTool.
Download AndroidTool_v2.65.rar and SDDiskTool_v1.56.zip
https://github.com/ADVANTECH-Rockchip/rk3399_tools/tree/android_7.1.2_ks
Step 1 : Using AndroidTool to create update.img
1. Put image to AndroidTool\rockdev\image.
2. Double click mkupdate.bat. in AndroidTool\rockdev.
Then you can find update.img in AndroidTool\rockdev.
Step 2 : Create update SD (Red word).
Step1 Choose the SD device.
Step2 Choose the "firmware update"
Step3. Choose the update.img path
Step4. Create the update SD
Create the Update SD card Success
''''Step 3 : Please power off in RSB4710.
''''Step 4 : Insert the SD card.
''''Step 5 : Power on in RSB4710.
''''Step 6 : Installing system update
''''Step 7 : Please Remove the SD Card when RSB4710 show the message "Doing Action succeeded. please remove the sdcard......".
''''Step 8 : Remove SD card then Reset RSB4710.