|WARNING: This device cannot run postmarketOS, as its architecture is unsupported.
A screenshot of a rooted 7" Onn Tablet Gen 3 running termux
|Tablet Gen 3
|4.14.186 [note 2]
|Arm-Cortex A53 MPCore 
|Arm Mali-G52 MC1 
|7" 1024x600 LCD [note 3]
|Unixbench Whet/Dhry score
The Onn Tablet Gen 3 is a low-end (The 7" model is only $50) android tablet by Walmart with decent hardware.
It currently cannot boot into the postmarketOS initramfs.
This port is part of the lowendlibre project.
Users owning this device
How to enter flash mode
To use mtkclient, hold down the power button until it shuts off. It should then enter preloader mode within a few seconds.
For fastboot, hold down Volume Up + Power while the device is off and then select the fastboot option. You can also use
adb reboot fastboot.
Use pmbootstrap to build your own installation image.
$ pmbootstrap init
$ pmbootstrap install --fde
You can then use mtkclient to flash the boot.img:
$ pmbootstrap export
$ mtk w boot /tmp/postmarketOS-export/boot.img
- The CPU itself is 64-bit, but the stock android build is 32-bit. It might be possible to boot 64-bit postmarketOS with u-boot, however that has not been tested yet.
- This is actually a pre-built kernel, as Walmart has not provided the kernel source tree as of writing this.
- There are multiple models of the Onn Tablet Gen 3 with different screen sizes and colors, but the hardware is the same.