Flashing from a Windows Computer using RK Batch Tool

You need perform these steps:

Step 1: Install the RockChip USB Device Drivers

1. Download the RockChip Driver Assistant from https://androidmtk.com/download-rockchip-driver-assistant Working version: v4.4 (v4.8 did not work for me)
2. Extract and run the assistant, click 'install' button to install the drivers, accepting the dialogs as needed
3. For Windows 8.1 and higher you need to add a registry key to cater for the RockChip bootloader in the Hudl advertising itself as USB v2.1 compatible, but not following the spec correctly. copy this text into a file with a .reg extension and double click it to apply the change to the registry:

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\usbflags\2207300B0100]
"SkipBOSDescriptorQuery"=hex:01,00,00,00

4. Connect your Hudl to your computer using a USB Cable and put it into bootloader/flashing mode: Option A: With the device powered off and not connected to the computer, press and hold the volume+ button and keep holding it while connecting the USB cable to the computer. Hold for another 5-10 seconds. Option B with the device in any state and connected to the computer by USB then hold the volume+ button and press the reset button through the small hole on the back of the case (with a SIM removal tool or paperclip).
5. If you are connected then you will see .... in device manager

Step 2: Install the RockChip Batch Tool program

Step 3: Install the RockChip Batch Tool program

Step 4: Download and unpack the TMF Custom ROM Firmware

Step 5: Connect your Hudl to the computer in flash mode

Step 6: Flash the TMF Custom ROM firmware

Step 7: Perform the post install steps