Since I can't directly host or email files, I'll do the next best thing: Official source (recommended): Use the Segway-Ninebot App (iOS/Android). Connect your device → Vehicle Settings → Firmware Update . Firmware is never distributed as standalone downloadable files for security reasons.
It sounds like you're looking for either (for scooters, go-karts, or self-balancing vehicles) or you want me to write a document titled "Ninebot Firmware Download." ninebot firmware download