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Bolt Glitching Multitool - Challenges

Challenge 1 - setup and pin mappings

Follow these instructions/hints etc at your own risk !! I can't be held respnsible for any damage you might cause to any of your devices!

Devices used:

  • Shikra to investigate UART ports (you can use RaspberryPi, Tigard, Buspirate etc)
  • ST-Link V2 (provided in the kit) (I had one and it had an older version that isn't supported by pyocd)

Software used:

  • screen
  • pyocd

1. Setup

There are many ways to install pyocd. Feel free to pick a method that works for you.

Install pyocd:

pip3 install pyocd

I also prefer screen for connecting to my Shikra (UART). Feel free to use any other alternative.

Install screen:

sudo apt install screen

2. Shikra or any device that supports UART

UART is s very simple protocol and here we have to connect the TX port on the Shikra to the RX on the target and then the RX port on the Shikra to the TX on the target and finally connect the GND from the Shikra to the target. (If you make a mistake just switch them over.)

3. ST-Link V2

Wire up the provided ST-Link v2 and the target board. You will be connecting to the JTAG port which are the pins SWDIO, SWCLK and GND from the ST-Link V2 to those found on the target board. I won't provide the pin numbers as the two ST-Links I have different pin mappings, so check yours first. It doesn't hurt to double and triple check connections)

4. Connect using UART

I used 3 bash windows. One for UART, a second for pyocd and a third for checking the output binary.

Here my Shikra is presented as device /dev/ttyUSB0 (yours might be a bit different)

Command (screen):

screen /dev/ttyUSB0 115200

5. Power up target

Now you can power up the target board via the USB-C port. You should get the following output via the UART in screen.

Output:

Hold one of the 4 challenge buttons to start them
Hold one of the 4 challenge buttons to start them

Move on to the next part, JTAG memory dumping using pyocd.