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We can look at StageFright as the example. When StageFright happened it was reported that all android and android based phones like our Mi Phones were affected. For the next few months Google didn't have an answer. Meanwhile a week after the reports Xiaomi gave us an OTA update that patched the StageFright issue. We've been immune ever since. But Google's patch that came months later was found to not be effective and more months later they had to patch it again.
Thanks for the update, hope MIUI can allow such patches to all phones affected even if it is Redmi 3S or otherwise. Hope Mi Community can have a MIUI security bulletin as i believe many MI fans love such news too.