Requirements: An Android Smartphone, USB OTG Adapter, ST-Link.
Note: You need to understand the fundamental principles of ST-Linking.
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Start by installing the Scooterhacking Utility. You will need to have Chrome installed.
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Open SHU (Scooterhacking Utility) and take a note of the MCU you have (AT32, GD32, STM32). Note your Odometer value (in km), and your SN.
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Go to the Webflasher. Choose your Scooter, enter the odometer value in km, enter your SN.
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Click "Start Flashing". Select the ST-Link, and wait for the flashing to complete. If you press "Start Countdown" flashing will start 15 seconds later, so you have both hands to hold your wires.
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Congrats, your controller should now be flashed!