Since the app is no longer actively maintained or available through official Apple channels, you can find the file in community-hosted repositories: Official Files Mirror : An archive of the is maintained on the ScooterHacking.org file server. Community Links : Users on forums like
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Provides a cleaner, more detailed view of battery cell health, motor temperature, and exact voltage than the official Segway-Ninebot app. Stance & Braking Tweaks: Since the app is no longer actively maintained