i'm using xiaomi 11t mobile phone and first time connect to the dash cam M500 but it fail.
You have the Chinese version of the M500. Install this app for China:
https://rom-cdn.70mai.com.cn/OTA_731_FULL_midrive_v2.2.5_20220226-1722_all_70mai.apk?t=1645867905996
Launch
Update the app to version 3.0.0.
You need to register again. (click Sign UP and register via email).
Add your M500
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