[Miscellaneous Android Development] wgarnett:
root tutorial using onda v820w ch v1 for example :

--root tools (root.zip) , unzip to c:\

https://drive.google.com/file/d/0BySA4DPrnBM-eXpsdlFzN21jQm8/view?usp=sharing

or

link：http://pan.baidu.com/s/1pLjJhHp

pwd：h79i

--use cmd and BOOTIMG.EXE to unpack boot.img

bootimg.exe --unpack-bootimg

-- use notepad++ open file \initrd\init*.rc , maybe called init.aosp.rc

--search string "class_start core" , add one line on this line's top

start sysinit

-- and then add these lines to bottom and save

service sysinit /system/bin/logwrapper /system/xbin/busybox run-parts /system/etc/init.d

disabled

oneshot

-- find another file called default.prop

modify ro.secure=1 to ro.secure=0

--use cmd and bootimg.exe to repack boot.img

bootimg.exe --repack-bootimg

rename boot-new.img to boot.img

after successfully boot into android , go to developer enable OEM Bootloader Lock and usb debug mode

download lastest supersu TWRP / FlashFire installable ZIP , copy to emmc flash or microsd card

http://xdaforums.com/apps/supersu/stable-2016-09-01supersu-v2-78-release-t3452703

unzip root.zip to c:\

-- install driver follow this order and new driver overwrite old driver

iSocUSB-Driver-Setup-1.2.0.exe

IntelAndroidDrvSetup1.5.0.exe

PhoneFlashTool_5.3.2.0_win32.exe

connect otg usb line and hold "volume-" restart tablet or you can find reboot app to enter fastboot mode

cmd run

fastboot flash boot boot.img

fastboot oem unlock

fastboot reboot

hold "volume-" and enter fastboot mode again

-- if twrp file is not working on your tablet , you can find others twrp version , you need try more by yourself

v820w ch twrp file : I use v919 ch twrp on xda forum , rename to twrp.img

--cmd run to enter twrp recovery mode , if tablet don't automatically to restart to enter recovery , you can use volume key to select recovery mode and power key to ensure

fastboot boot twrp.img

connect mouse because touch fuction maybe not work , twrp install supersu recovery zip , root finish

you can use app like foldermount now

if play store has new version supersu , you can update app

but you can't install "binary" from app , it will damage system , if you do , you will find microsd size always 1GB max

so , how to install supersu "binary" , you only need use above step about flash twrp and install lastest recovery zip , after install lastest supersu zip file , on table you run supersu , it will not show any update "binary" request .

p.s. Onda Table Full Gapps Firmware

http://xdaforums.com/android/development/onda-table-gapps-firmware-root-tutorial-t3462774

dual os tablet can use 64gb/128gb microsd card , you need use GUIformat to format to FAT32

dual os all can read/write it

if you have highspeed microsd compatible issue

I suggest you can buy speed < 50 mbps/s sandisk microsd

it work fine on onda tablet

on windows , you can use micorsoft official download win10 version to install

for example onda tablet , you need to do two things

1. backup driverstroe \ FileRepository , after reinstall new win10 , you can use device manager to find lose drivers .

2. backup \system32\drivers\sileadtouch.fw , you need to copy this touch location driver to new win10 .

win10 touch gamepad

china version is free , you don't need to pay to buy 8-axis , function is useless :

https://www.microsoft.com/zh-tw/store/p/微派平板助手/9nblgggzlx51

guide translation here , look attachments pictures : http://xdaforums.com/windows-8-rt/general/tutorial-onsceen-gamepad-touchpad-t3104501

english version is free to try :

https://www.microsoft.com/zh-tw/store/p/touch-anyway/9nblggh31d54