[Miscellaneous Android Development] protectivedad:
*** Use at your own risk these instructions worked for me on MY tablets that is no guarantee they will work for you ***

This is for the ProScan PLT9650G(K-1G-8G) tablet. It has the RockChip RK3126 chipset. The one I am working with was purchased in Canada at the Atlantic Superstore. I will just briefly outline what I needed and had to do to root and install a TWRP recovery on the tablet. See the attachment for the recovery image. I will explain how to get the programs and general steps to make a full backup of the tablet before ever rooting the device. It is a little difficult, and not necessary, but like any backup can be helpful to have around.

Specifications:

The ProScan tablet has:

- Android Lollipop 5.1.1;

- Quad-core Processor, 1.2Mhz;

- 1 GB of DDR3 Memory;

- 8GB Flash Storage;

- 800x480 Screen Resolution.

Backup Overview:

1) Install USB drivers;

2) Put tablet in bootloader mode;

3) Read the different partitions.

Tools Needed:

1) Rockchip Driver Assistant v4.3;

2) Android Tool v2.3.

Detailed Instructions:

This tablet is a newer version and requires at least version 4.3 of the Rockchip Driver Assistant. The older versions (4.1) won't recognize the USB product id (310D) in bootloader mode.

Download the drivers unrar and run DriverInstall.exe. Select uninstall to clean any old drivers and then select install to install the newer ones. I've done this under Windows 7/8.1/10. Since I've done it so often and so many times with different driver version, I can't remember if the bootloader drivers require you install them with the driver signing turned off or not. The problem becomes that the bootloader drivers (under Windows 8+) will fail the driver signing authentication and won't install. The ADB and MTP drivers are signed and will install correctly, but when you boot the tablet in bootloader mode the device will be unrecognized by Windows. If you end up with this problem follow these instructions and then install the drivers.

After testing on a new machine under Windows 10 the drivers install fine. There is no need to boot with driver signing verification turned off.

To put the tablet in bootloader mode follow thes instructions:

1) Unplug tablet (both power and usb);

2) Turnoff tablet;

3) Press and hold the esc and power buttons at the same time;

4) Hold until the stock recovery menu comes up;

5) Press the esc button to go down to the menu item saying bootloader;

6) Press the power button to execute that menu item.

The screen will go blank. Plug the tablet into the computer and it will be recognized as a device type "Class for rockusb devices" in the Windows Device Manager.

Download the Android Tool from the link provided. The link gives a detailed description of how to backup all the partitions. I have included my parameters.txt file that I created. From the standpoint of undoing the root operation described below I believe only the recovery and system partition needs to be saved. But saving all the partitions never hurts. After you have followed the information in the link and saved the partitions you can move on to rooting the device.

One serious warning I have NOT been able to write anything to the device using the Android Tool. It always give me an error and won't even try. The backups we create can be used from within the tablet to restore it later if needed.

Custom Recovery Overview:

1) Root device;

2) Download the image file on the tablet;

3) Flash the recovery partition with the image file.

Tools Needed:

1) KingRoot;

2) Terminal Application;

Root Device:

The device rooted using KingRoot. Startup the tablet and go through the setup process. Download the apk from the link provided. The version used in testing was 4.6.2. You will need to allow "Unknown sources". The app will eventually give a button just try to root. This will eventually work and the tablet will be rooted.

Extract the img file from within the zip file below onto the internal drive. Make sure you put it in the Download directory. If you are doing this from the tablet it should go there if you move it over using the computer make sure you put it in that directory or change the command below to the proper directory.

Install a terminal emulator. Anyone will do, the one I chose is linked above. Open the emulator and type:

su

at the prompt. KingRoot should prompt you asking if you want to grant root privilege to the command prompt. Then type the command:

dd if=/sdcard/Download/TWRP_800x480_Unified.img of=/dev/block/rknand_recovery bs=4096

. That's it if you type:

reboot recovery

the tablet will reboot and TWRP should start up.

Notes:

If you saved the original system partition you can install it using TWRP and effectively unroot the device but keep the TWRP recovery. With the recovery image you can install it over the TWRP and return the tablet to its stock state. I'm giving these tablets to my kids and I wanted a way to return them to the state I bought them plus after I've personalized them for each of my kids I can make a backup in case they do something that messes them up.

This will also work for the PLT1065G but you need to use different recovery/parameters. The kernel is different (looks like a different touchscreen).