Change startup password of Meter YL81F

The startup password of the meter supports user-defined change. Before changing the password, you need to start the instrument successfully and enter the homepage of the instrument, otherwise you can't proceed to the next step.
Step 1: After successfully starting the meter, long press + and - to enter the meter setting page.
Step 2: Switch to 18P, press "i" to confirm and enter "PSD-Y".
Step 3: Modify the password, press "i" to save.
Step 4: Press and hold "i" key to exit to the home page of the meter.
Step 5: Reboot the meter

[@user-dy6cm2xi5b]

Thank you, working exactly how your showing

[@Triggah001]

do you know why my bike only does 25 kmh after first loading the battery? Did the factory reset but still maximum speed is 25 kmh.
before the first loading it did 55 kmh without any problems.

[@ceayabikes]

It should have something to do with the parameter settings. It could be that you have set it to 25km/h, you can refer to see the video programme about the meter limiting the speed. As a reminder, the maximum load speed of the motor should not exceed 45km/h, otherwise the motor may burn out. So please don't set it more than that.
The link is below:
ruclips.net/video/u7pjiCsyn3A/видео.htmlsi=USGBLJ8gu8FVbgR1