According to the XDA Developer, This change was first spotted in the firmware dumps of the Mi 9’s MIUI 10 China 9.3.18 build. Strings present inside the “Security Center” APK suggested that Xiaomi would be blocking “unverified” third party launchers from being set as the default launcher on the device.
These strings then continued to make an appearance in firmwares released after March 18, 2019. Finally, with MIUI 10 China 9.4.1, i.e. the build released on April 1, 2019 for the Xiaomi Mi 9, users were prevented from setting other launchers as their default homescreen launcher.
Third-party launchers are allowed on China ROM-based Xiaomi smartphones after a verification process. Any launcher that is approved to be listed on the Mi App Store (our app marketplace in Chinese Mainland) will automatically be verified, and can be used on MIUI smartphones running the China ROM. There are no plans to implement a verification process for launchers on the global (including India) firmware – Xiaomi Member.
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