1. Loss driver after upgrade such as touch driver, WLAN card driver etc.
Solution: Download the latest window10 driver and install: http://pan.baidu.com/s/1kTtgOlT

2. Dual system models after upgrade, boot automatically prompt switching system
Solution: Download the latest Q2S switch tool and reinstall: http://pan.baidu.com/s/1c0e2bMo
a. Q2S_X64.msi: for V919 3G Core M
b. Q2S_X86.msi: for V820W dual os, V891 dual os, V891W dual os, V919 AIR dual os V1V3V5, V919 3G AIR dual os V1V3, V116W dual os tablet

3.Camera can't operate,appear Unknown Error.
Solution: Update to load the latest camera driver.

4. The screen can't normal operate after upgrade.
Solution: Connected to the mouse and keyboard with OTG cable, download Windows10 driver and the original driver, install Win10 driver first and then install the original driver, it will be OK.
Update Tool: http://pan.baidu.com/s/1o6Kfgt8
Windows10 driver: http://pan.baidu.com/s/1kTtgOlT
Original driver: http://pan.baidu.com/s/1dDCmYZJ

5.Dual boot model after restore factory Settings, interface as the following shows:

onda win10 tablet

Solution: Connected to the mouse and keyboard via OTG cable, enter system and reinstall Q2S system switching program.