BURCHDA ebike YL-81F instrument new version of the second-level speed limit release tutorial:
1. Press and hold the ββ keys at the same time to enter the parameter interface, and then press and hold the ββ keys again to enter the password interface.
2. Enter the password: 2847 (press the β or β key to enter the password, and press the i key to switch to the next digit) to enter the speed limit interface.
3. After entering, press the i key, the value below flashes, and press or hold the β key to adjust the speed limit value.
4. Press and hold the i key again to save and exit
