Very useful user comment by M Johnson:
To anyone else, I almost broke it as well. You have to undo the rubber handle and loosen the brake with an Allen wrench before you can take the plastic 2 screw piece off.

Change your tires on your own: https://amzn.to/3pUHz14

Error Code 15 When the EScooter beeps 1 time long and 5 times fast is a Error code that makes the Xiaomi EScooter stop. We show you one possible solution!