u/Eisenpirat

So I bought a used XIAOMI 4 for 115€ and it works fine. I just realized, that it should have a brake light. When I pull the break, the light does not turn on. The rear light is working without flaws when I switch the lights on. I know, there´s things to check but where to start. I wanna check the switch in the brake handle first. where exactly is it located in the handle? Any suggestions what to check then? In case this is not the issue.

I read a lot but did not find a solution on the Xiaomi page.

I bought a used XIAOMI 4 scooter without QR code. It is not locked but I want to connect it to the app.

The XIAOMI page has a link to a SN database and links to generate the code with. But only for the 4 PRO. My SN starts with 46442CSAF and I can not find it. Can anyone here help me?