TST Mode (Recommended)

1. Connect the Edge-2L Type-C port 2 to your PC using a USB-C data cable.
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2. Quickly press the Function key three times within two seconds, then release it. The Power LED (red) will blink for approximately three seconds.
3. After the Power LED (Red) turns off, the board has entered Upgrade Mode (Maskrom Mode).

Serial Mode

1. Connect Edge-2L Type-C port 2 to your PC using a USB-C data cable.
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2. Set up a serial debug console by following the guide: Setup Serial Tool for Edge-2L.
3. Ensure all connections and serial settings are correct.
4. During boot, press the Spacebar on your keyboard to interrupt autoboot. This will drop you into the U-Boot command line.
5. At the U-Boot prompt, type run update and press Enter. The red LED will illuminate, indicating successful entry into Upgrade Mode.

Linux Command Line

1. Set up a serial debug console by following the guide: Setup Serial Tool for Edge-2L.
2. Ensure all connections and serial settings are correct.
3. Boot your Edge-2L into Android or Linux and obtain a command-line shell (via serial or SSH).
4. Execute the appropriate command:
   1. On Linux: Run sudo reboot loader.
   2. On Android: Run su followed by reboot loader.

The system will reboot and enter Upgrade Mode (Loader Mode). The red LED will turn on to confirm.