Does anyone know what kind of firmware the electric scooter called e-way e500 its solder under wilfa but its just a rebranded scooter from kingsong?

[jzraa]

When i first got it i had the firmware version 1.20 and discoverd that you could remove the speed limit on it. i updated it from 1.20 then to 1.26 and that version felt very weird and you had to like spam press the throttle to reach the speed limit but then i tried out 1.31 and it felt so much better but now after llike 1-2 years of owning the e scooter i would like to to try to use the firmware version 1.20 but it wont update just shows "updating" while nothing is happening so im forced to go back to 1.31? anyways if anybody knows what kind of firmware they are using lmk i would like to try to make a custom version for my self.