You can increase the speed with the app "Xiao Flasher for m365". To do this, connect the app to the scooter. Then you can change the region and thus also the speed under "Change Region". With German Maneuver, you can set whether it should remain as it is or whether the old settings should apply again after a restart.
Yes, you are welcome to tune it. But as soon as the repair turns up, the warranty is void (insider) Don't worry, we'll see when it's been tuned :) otherwise, read the warranty conditions from segway :)