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Last updated: August 26th, 2015 at 15:00 UTC+02:00
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Android 5.1.1 brings behind-the-scenes changes to performance, battery life and the overall user experience, and it should also include a fix for the Stagefright vulnerability unless Samsung is planning to patch that with an additional update. You can go into the Settings » About device » Software updates menu and hit that Update now button to see if the OTA is available, or just wait for a notification to pop up on its own. You could also try flashing the firmware available at the source link; we're not completely sure it's the final version of the update, but the comments suggest it works properly and doesn't have any issues.
Update: We've seen a lot of comments on XDA saying that the update doesn't bring 64-bit support, so we thought we should point out that 64-bit support will never come to the Note 4 since only the Exynos version has 64-bit capabilities. The Snapdragon 805 used in the other variant is a 32-bit processor, and Samsung is unlikely to offer 64-bit support to only one section of Note 4 users and not the other.
Abhijeet's writing career started with guides for custom firmware for Samsung devices (including the original Galaxy S), and he moved to SamMobile in mid-2013 and worked up the ranks to Editor-in-chief. In addition to phones and mobile devices, his interests include gaming on both PC and console, PC hardware, and spending countless hours on YouTube watching videos on tech, movies, games, politics, and internet dramas.
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