1 It opens at first "AndroidTool_Release_v2. 35 upgrade tool" open "AndroidTool" upgrade tool as shown in figure. 

2 Choose "upgrade firmware" open after the upgrade tool and then find the need to upgrade the firmware. 

3 Use the SUB lines to connect the computer and advertising machine

4 Looking for a small needle inserted into the "switch machine button next to the hole (there is a button) hold don't let go, and then insert the power supply

4 Looking for a small needle inserted into the "switch machine button next to the hole (there is a button) hold don't let go, and then insert the power supply

5 After power on "the discovery of a LOADER equipment" will loosen small needle point, and then click "upgrade"

6 After the success of the switch click upgrade

Or you can refer to below demo video, 

https://www.youtube.com/watch?v=-0Fd-9zAOJ8&t=11s

Below is the link for the batch tool/USB driver, you need a windows system computer for the whole process, 

http://www.mediafire.com/file/5k6u319oq7x1c1z/All_in_one_Update_Tool_incl_Win10.zip 

The link for 43/55 inch Rockchip3288 AIO pc, 

https://drive.google.com/open?id=1B8m_37EQsBfgng_4CJGBV11O7Eg5hQsI 

Below is the link for Rockchip3399, 

https://drive.google.com/open?id=1pmV6QX66e8pz2UWzdIBKk2Jv_kI63SEp