If you own a Mi A1 you should have received the over-the-air update notification for December Security Patch, and it's crucial that you download it, as it brings along the fix for the KRACK vulnerability.
The December 2017 Android security update for the Mi A1 weighs in at around 153MB. Note that the device still runs on Android 7.1.2 Nougat after the update. For a successful installation, the battery in your phone should be at least 50% charged and your device should be connected to a Wi-Fi network or LTE.
If you haven't got the notification of this new software update yet, Just go to Settings - About Phone - Software updates, and It will automatically start downloading the latest update. The update will take around 10-15 minutes to get Installed on your device. Stay tuned to our Facebook and Twitter page to get the first News.