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How to unlock the MCU flash

EmanuelFeru
2020-02-07 18:08:15 +01:00
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This wiki page explains how to unlock the flash of an STM32 or a GD32 to allow re-flashing with a custom firmware.
### WARNING: This procedure can erase the MCU firmware irreversibly! Perform these steps at your own risk!
# Method 1: Using ST-Link Utility
* Step 1: Download and install the [ST-Link Utility](https://www.st.com/en/development-tools/stsw-link004.html)
* Step 2: Connect the ST-Link programmer to the MCU programming pins GND, SWDIO, SWCLK. Connect the 3V3 pin only if your MCU is not powered externally.
* Step 3: Open the ST-Link utility and press Connect to target
![unlock1](https://raw.githubusercontent.com/EmanuelFeru/hoverboard-firmware-hack-FOC/master/docs/pictures/unlock_mcu_1.png)
* Step 4: If you get the message "Can not read memory!" the MCU is most probably locked
* Step 5: Go to Target and click Option Bytes
![unlock2](https://raw.githubusercontent.com/EmanuelFeru/hoverboard-firmware-hack-FOC/master/docs/pictures/unlock_mcu_2.png)
* Step 6: Select Disable in Read Out Protection drop-down menu
![unlock3](https://raw.githubusercontent.com/EmanuelFeru/hoverboard-firmware-hack-FOC/master/docs/pictures/unlock_mcu_3.png)
* Step 7: Click Connect to target
![unlock4](https://raw.githubusercontent.com/EmanuelFeru/hoverboard-firmware-hack-FOC/master/docs/pictures/unlock_mcu_4.png)
* Step 8: If you see the window above, then you have successfully unlocked your MCU. You can now flash the MCU.
# Method 2: Using Ubuntu
* Step 1: Install the [ST-Flash Utility](https://github.com/texane/stlink)
* Step 2: Install [OpenOCD](https://zoomadmin.com/HowToInstall/UbuntuPackage/openocd)
* Step 2: Connect the ST-Link programmer to the MCU programming pins GND, SWDIO, SWCLK. Connect the 3V3 pin only if your MCU is not powered externally.
* Step 3a: Open a terminal and send the following OpenOCD command:
```
openocd -f interface/stlink-v2.cfg -f target/stm32f1x.cfg -c init -c "reset halt" -c "stm32f1x unlock 0"
```
* Step 3b: If that does not work. Try:
```
openocd -f interface/stlink-v2.cfg -f target/stm32f1x.cfg -c init -c "reset halt" -c "mww 0x40022004 0x45670123" -c "mww 0x40022004 0xCDEF89AB" -c "mww 0x40022008 0x45670123" -c "mww 0x40022008 0xCDEF89AB" -c "mww 0x40022010 0x220" -c "mww 0x40022010 0x260" -c "sleep 100" -c "mww 0x40022010 0x230" -c "mwh 0x1ffff800 0x5AA5" -c "sleep 1000" -c "mww 0x40022010 0x2220" -c "sleep 100" -c "mdw 0x40022010" -c "mdw 0x4002201c" -c "mdw 0x1ffff800" -c targets -c "halt" -c "stm32f1x unlock 0"
```
```
openocd -f interface/stlink-v2.cfg -f target/stm32f1x.cfg -c init -c "reset halt" -c "mww 0x40022004 0x45670123" -c "mww 0x40022004 0xCDEF89AB" -c "mww 0x40022008 0x45670123" -c "mww 0x40022008 0xCDEF89AB" -c targets -c "halt" -c "stm32f1x unlock 0"
```