Secure Boot

Secure Boot is a new protection feature implemented by Unitree to combat jailbreaking and unauthorized software modifications by users. The main idea behind it is to ensure that partitions are signed only with a private key, which is exclusively held by Unitree headquarters. Early Go2 units with the Secure Boot feature began appearing in January 2025. To detect what type of boot you have follow the steps below:

Rkdeveloptool Installation

Install the necessary build dependencies. Open a terminal and run:

sudo apt-get update
sudo apt-get install -y git libudev-dev libusb-1.0-0-dev dh-autoreconf

git clone https://github.com/rockchip-linux/rkdeveloptool.git

git clone https://github.com/wing-kit/rkdeveloptool

Navigate into the cloned directory:

cd rkdeveloptool

Compile rkdeveloptool from source:

autoreconf -i
./configure
make

Once the build process is complete, install rkdeveloptool:

sudo make install

To ensure rkdeveloptool was installed correctly, you can run:

rkdeveloptool -h

This command should display the help information for rkdeveloptool, indicating successful installation.

Getting the preloader

First, let's remove the top cover from the robot. Please refer to video of disassembly of Go2

To enter Loader mode, first connect a USB Type-C cable from the device to the PC. Then, press and hold the upper button on the mainboard while turning on the Go2. The robot should not stand up after this action.

After the loader mode

Check it by running:

sudo rkdeveloptool ld

You should see the device in Loader mode . Then, let's save a preloader.img from the Go2.

sudo rkdeveloptool rl 0x00 0x4000 preloader.img

Inspect the preloader

Download the script from here (opens in a new tab)
Change the permissions to executable:

sudo chmod +x inspect_boot_type.sh

Inspect the preloader

./inspect_boot_type.sh preloader.img

For non-Secure boot Go2 you`ll see:

+======================================================================+
| Boot Type: Non-Secure Boot (Signature: RKNS)                         |
+======================================================================+

For Secure boot Go2 you`ll see:

+======================================================================+
| Boot Type: Secure Boot (Signature: RKSS)                             |
+======================================================================+