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Updated How to Unlock MCU Flash (markdown)

EmanuelFeru
2020-02-26 14:50:50 +01:00
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How-to-Unlock-MCU-Flash.md

@@ -6,25 +6,31 @@ This wiki page explains how to unlock the flash of an STM32 or a GD32 to allow r
* 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
* 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
* 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 and click Apply
* Step 6: Select **Disable** in `Read Out Protection` drop-down menu and click `Apply`
![unlock3](https://raw.githubusercontent.com/EmanuelFeru/hoverboard-firmware-hack-FOC/master/docs/pictures/unlock_mcu_3.png)
* Step 7: Click Connect to target
* 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.
## Troubleshooting
If you get funny, unexpected behavior from your board after flashing (see this [thread](https://github.com/EmanuelFeru/hoverboard-sideboard-hack-GD/issues/3)), it is most likely that the unlocking process did not succeed properly. To fix it follow these steps:
* Step 1: Lock the GD32 following the Steps above in reverse order
* Step 2: Unlock the GD32 as described above, however at Step 6, check all the boxes for `User configuration option bytes`
* Step 3: Click `OK` if you get any error/warning.
* Step 4: Flash the firmware and try
# Method 2: Using Ubuntu