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Hey there. I just want to share my recent experience with flashing windows images on a V919 Air tablet.
The reason for the reinstallation was that after a system reset in windows 10, things went wrong with the touch screen. It registered touches at completely wrong places and orientation. I tried calibrating it using the buildin windows 10 utility and it did nothing.
The step I struggled with for several days was that none of the system images downloaded from the official site was able to boot on this tablet. Eventually I stumbled upon an old web page with a 32bit windows 8.1 image and it worked. The system was then upgraded to windows 10 and everything appeared fine.
If you encountered similar diffficulties in booting the images from Onda, see if the images are 64 bit. All the ones I initially downloaded are 64 bit, and they are not recognized by this tablet. Only 32 bit UEFI files can boot. Same if you want to use some windows PE images, 32bit ones are needed.
Based on the serial number, mine is probably a V5 version of V919 Air 64 GB DualOS.
View File V891_DualOS_v1_v3_win8 20151113
V891 dual system _Win8 system image (for V1 and V3 version only)
1.Win8.1wBing version of the system image, it contains the complete driver.
1. This directory contains system installed under the tutorial,
follow the tutorial operations.
Baidu : http://pan.baidu.com/s/1mgGSUl6
Submitter RobV Submitted 12/21/2015 Category V891 Dual System