It seems that as soon as we update the system, we just launched oxygen OS 4.0.1 to our flagship last week, and now we will launch oxygen OS 4.0.2 again. From the system version number, it can be seen that this is not a major upgrade, only some small bugs have been fixed, and the system version has not been upgraded to Android 7.1. This upgrade mainly focuses on APN settings, the repair of distance sensor failures during calls, and the bug repair when downloading software in Google Play Store. At the same time, it also improves the overall stability of the system.

Therefore, you may not be able to detect the difference in your subjective feelings, but users who use oxygen OS can update it.

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