KD926 instrument unlocks speed limit:
1. Press and hold the ➕➖ keys at the same time to enter the setting interface, then press and hold the i and ➖ keys at the same time to enter the secondary interface
2. Short press the i key to go to the LS interface, short press the ➕ or ➖ key to adjust the speed limit value
3. After adjusting the speed limit value, long press the i key to save and exit
