Repository with firmwares for the KQi 300X and KQi 300P scooters, these files where collected from various places. Also the JSON descriptors values are provided with information like the filename, type and MD5.
You will need to download a modified version of the NIU app from this link for this process to work (uninstall normal NIU app first). https://mega.nz/file/V01TVagK#Mw7OVa8gaJmrQb76mKMFnU3mWu4DmnS30eGigmxLHc4
Tutorial (in Spanish but with subtitles it should be OK) https://www.youtube.com/watch?v=40BTCnkcEHg
There is also a screen recording video, thanks to Aiden Amur. https://youtu.be/GPu56XE8uBI
KQi 300p motor controller upgrades are not yet available for capturing. If you have a 300p and are notified in the app that there is a firmware update available, do not install it - raise an issue here and instructions will be provided so we can capture it.
https://github.com/hjcday/KQi-300-X-P-Firmware/raw/main/300X/DE/update.json
Has max speed of 22km/h and some features are disabled to comply with German regulations
https://github.com/hjcday/KQi-300-X-P-Firmware/raw/main/300X/EU/update.json
Has max speed of 25km/h, Halo Ring Daytime Light, Cruise Control
https://github.com/hjcday/KQi-300-X-P-Firmware/raw/main/300X/US/update.json
Has max speed of 38km/h, Halo Ring Daytime Light, Cruise Control