Galaxy S21 series gets Samsung's October 2024 security update

Samsung's October 2024 security update is rolling out to the Galaxy S21 lineup. The update hit the Galaxy S24 series in early October, and since then, it has been making its way to older Galaxy S flagships in descending order.

Now, Galaxy S21, S21+, and S21 Ultra owners in some European markets and the USA can grab the October 2024 update on their phones. The rollout began just a few hours ago and shouldn't take long to expand to more countries and regions.

The update can be identified by the build number G99xBXXSDGXI5. It's a purely security-focused update and doesn't bring any other changes or improvements. Once installed, it will bump the security patch level on your Galaxy S21-series phone to October 1, 2024.

The October security patch adds protection against 42 security vulnerabilities discovered in the previous software version. It also addresses an issue discovered in Samsung's Exynos chips, including the Exynos 2100 powering the Galaxy S21 lineup in most countries.

To download the latest update, navigate to your Galaxy S21, S21+, or S21 Ultra's Settings » Software update menu and tap the Download and install button. You can also download Galaxy S21 firmware from the SamMobile archives and install it on the phone using a Windows PC.

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Abhijeet Mishra - Editor-in-Chief

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First Samsung device: SGH-D500

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.

Firmware Phone Galaxy S21 Galaxy S21 Plus Galaxy S21 Ultra October 2024 Security Patch