QMK Firmware Update Tutorial (macOS)
Using V5 Max ANSI Knob as an example.
1. Click "Connect"

2. Click your keyboard name

3. Click "Connect"

4. Click "Next"

5. Unplug the cable

6. Hold "esc" and plug the cable back in

7. Click "Match device"

8. Click "STM32 BOOTLOADER" and "Connect"

9. Click "Flash Firmware"

10. Wait for the update to complete — a success message will appear.
Do not disconnect the keyboard during the process.

Here is the video tutorial: