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July 2020 security update is the Android 9-based MIUI 10 update. The device will get the MIUI 12 update based on Android 9 at the end of October.
The firmware version of this update for Mi MIX 3 5G is V10.3.26.0.PEMEUVF and an update package size of 469MB. You can manually download and install the update from the link mentioned below.
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