Reverse engineering my cloud-connected e-scooter and finding the master key to unlock all scooters

A few years ago, I decided to buy an electric scooter for commuting in the city. I had already been using rental scooters for a while, but got tired of having to "hunt" for one or realizing there isn't one near my apartment building when I wanted to go to work in the morning. I decided to go with an Äike T. This wasn't because it was necessarily better than the competitors' products. In fact, the…