[Miscellaneous Android Development] ViAlexSt:
[IMG="onda logo"]https://s19.postimg.org/kfnrp4osj/ONDA_logo.jpg[/IMG]​

Firmwares Features

pre-rooted (SuperSU 2.65 free of Chainfire)

pre-Gappsed

busybox 1.24.1

removed the Chinese program (and at the same time CleanMaster as not a multilanguage application)

the region changed from Chinese to universal "en_US", timezone is GMT

fix ext-sdcard write issue

boot unsecure because of activation of root-access

improved screen density (320 dpi -> 280 dpi for a more enjoyable perception)

that's all, folks!© , more no system changes, firmware "as is"

Credits

Company Onda for better hardware, but software is unfinished;

@Chainfire for superuser;

@A.S._id for his wonderful tools ANDROID_IMG_REPACK_TOOLS;

and thank me for the work done.

Installation

1. Brief manual based on the Chinese instructions

Warning! Flashing the firmware will erase all your data! In addition, the need to re-install Windows!!!

format the flash drive of no less than 2 GB in FAT32 (in any way, I used to use a program Rufus);

copy to the root of the flash drive the contents of the archive with the firmware (not as a folder!);

turn off the tablet*, via OTG-adapter to connect to the device USB-hub with keyboard and your prepared flash drive;

turn on the tablet, when the Onda logo appears, press F7 on USB-keyboard to bring up the boot menu;

in the list to select your flash drive and press Enter - the installation process will begin automatically, takes approximately 2-3 minutes.

*Attention:: the recommended battery before flashing - not less than 60%

2. The alternative method of installation without having to reinstall Windows

Many thanks to the author of the method mirek190

I only slightly edit the script and updated the drivers.

install the supplied drivers in accordance with their numbering (from the program PhoneFlashTool only need dnx-drivers)

unzip to a convenient location archive mirek190_flash_tool_v1.1_Onda, in a subfolder "rom" to copy the contents of the archive with the firmware

shut down the tablet under Android; simultaneously holding the power button and volume "+" and "-" to upload device in DnX fastboot mode, waiting for the relevant notes on-screen

connect the tablet to PC, to execute the file FLASH.bat, in the screen that appears, choose installing option 1 - "dirty" install, preserving user data or 2 - clean install, wiping all Android partitions/data (except SD card)

Drivers

mirek190_flash_tool_v1.1_Onda

Firmwares

20160216 - basic Chinese stock firmware V919 AIR CH DUALOS android固件(适用于V7版本)-20160216 [固件]

Download

20160307 - basic Chinese stock firmware V919 AIR CH 双系统android固件(V7版本)-20160307

Download

20160429 - basic Chinese stock firmware V919 AIR CH 双系统android固件(V7版本)-20160429

preinstalled Gapps (original - not my doing)

the original Chinese version of Google Play can be extra closed with an error, so I advise you to update the program

the firmware is no service Google Play Games, maybe gamers cause an error, so I suggest to add this service: link to Google Play

Download

Mirror Google Drive

[md5] 2c97529e4189efd64881623a5bf82be1 *Onda.v919.Air.CH.Dual.v7.Root&Gappsed.7z

20160531 - stock English firmware with Gapps

Download

20160706 - official firmware with Gapps and with Chinese apps

V919 AIR CH 双系统android固件（适用于V7版本）-20160706 [固件]

20160729 - international firmware with Gapps and no Chinese apps

Download:

AndroidFileHost

V919 AIR CH 中性固件（适合014版本以上BIOS）-20160729

Firmware update to version 20160429/.../201607* some of revisions of the tablet can cause loss of sound.

If that is the case - update BIOS: http://xdaforums.com/showpost.php?p=69168574&postcount=176​

.

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TWRP 2.8.7.0

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Remix OS 2.0

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How to get root access on tablet Onda v919 Air CH DualOS