Galaxy S24 SM-S921N firmware

The latest stable build is S921NKSSIEZJ1 (Android 17, security update), first released on Oct 22, 2026 – 15 days ago. Samsung has published 37 stable builds for this model since Jan 25, 2024: 24 security and 13 feature updates, from Android 14 to Android 17. The current bootloader (binary) version is 18. A device on bit 18 only accepts firmware with bit 18 or higher – see downgrading and the bootloader bit.

Latest build
S921NKSSIEZJ1
Released
Oct 22, 2026
Android
Android 17
Bootloader bit
18
Regions
4
Stable builds
37

Latest firmware by region (CSC)

Samsung builds firmware per region code (CSC). Pick the code that matches your device – it is shown under Settings › About phone › Software information › Service provider software version. Follow a code for its complete history.

CSCRegionLatest buildAndroidReleasedBuilds
KOOSouth KoreaS921NKSSIEZJ1Android 17Oct 22, 202652
KTCSouth Korea (KT)S921NKSSIEZJ1Android 17Oct 22, 202652
LUCSouth Korea (LG U+)S921NKSSIEZJ1Android 17Oct 22, 202651
SKCSouth Korea (SKT)S921NKSSIEZJ1Android 17Oct 22, 202651

Firmware history (37 builds)

Every stable build (PDA version) Samsung has published for the SM-S921N, newest first. “” is the earliest date the build appeared on Samsung's servers in any region. “” means Samsung no longer serves the file for that build.

Build (PDA)ReleasedAndroidTypeBitRegionsFile
S921NKSSIEZJ1Oct 22, 2026Android 17Security184on server
S921NKSUHEZIFOct 6, 2026Android 17Feature174on server
S921NKSSHDZH3Aug 26, 2026Android 16Security174on server
S921NKSSGDZG1Jul 15, 2026Android 16Security164on server
S921NKSSFDZF3Jun 18, 2026Android 16Security154on server
S921NKSSFDZE1May 28, 2026Android 16Security154on server
S921NKSUEDZDRMay 11, 2026Android 16Feature144on server
S921NKSSECZCHApr 8, 2026Android 16Security144on server
S921NKSSDCZC1Mar 23, 2026Android 16Security134on server
S921NKSSDCZB4Feb 26, 2026Android 16Security134on server
S921NKSSCCZA1Jan 15, 2026Android 16Security124on server
S921NKSSBCYL1Dec 11, 2025Android 16Security114on server
S921NKSSBCYK2Nov 17, 2025Android 16Security114on server
S921NKSSACYJ3Oct 24, 2025Android 16Security104on server
S921NKSS9CYI9Oct 1, 2025Android 16Security92on server
S921NKSU9CYI5Sep 22, 2025Android 16Feature94on server
S921NKSS9BYG8Aug 11, 2025Android 15Security94on server
S921NKSS8BYF1Jul 10, 2025Android 15Security84on server
S921NKSS7BYE9Jun 12, 2025Android 15Security74on server
S921NKSS6BYDFMay 12, 2025Android 15Security64on server
S921NKSU5BYD9Apr 17, 2025Android 15Feature54on server
S921NKSU5BYCGApr 7, 2025Android 15Feature54on server
S921NKSS5AYB1Mar 6, 2025Android 14Security54on server
S921NKSS5AYA1Feb 10, 2025Android 14Security54on server
S921NKSS5AXL1Jan 7, 2025Android 14Security54on server
S921NKSS5AXKADec 9, 2024Android 14Security54on server
S921NKSU5AXK4Nov 19, 2024Android 14Feature54on server
S921NKSS4AXJ1Oct 15, 2024Android 14Security44on server
S921NKSU3AXH7Sep 5, 2024Android 14Feature34on server
S921NKSS3AXGJAug 12, 2024Android 14Security34on server
S921NKSU3AXFGJul 11, 2024Android 14Feature34on server
S921NKSU2AXE4Jun 10, 2024Android 14Feature24on server
S921NKSS2AXE1May 16, 2024Android 14Security24on server
S921NKSU1AXCAMar 26, 2024Android 14Feature14on server
S921NKSU1AXBAFeb 28, 2024Android 14Feature14on server
S921NKSU1AXB5Feb 16, 2024Android 14Feature14on server
S921NKSU1AWM9Jan 25, 2024Android 14Feature14on server

Beta and test builds

Samsung's servers also list 14 beta build(s) for this model. They are not offered to regular users and are often removed after the next stable release.

BuildListedFile
S921NKSUHZZI4Sep 15, 2026pulled
S921NKSUHZZHLSep 3, 2026pulled
S921NKSUEZZDDApr 20, 2026pulled
S921NKSUEZZD5Apr 9, 2026pulled
S921NKSUDZZCDMar 26, 2026pulled
S921NKSU9ZYI3Sep 11, 2025pulled
S921NKSU9ZYHBAug 29, 2025pulled
S921NKSU9ZYH3Aug 13, 2025pulled
S921NKSU5ZYCEMar 26, 2025pulled
S921NKSU5ZYC6Mar 17, 2025pulled
S921NKSU5ZYBAFeb 19, 2025pulled
S921NKSU5ZXLJJan 6, 2025pulled
S921NKSU5ZXL5Dec 16, 2024pulled
S921NKSU5ZXKZDec 5, 2024pulled

How to download SM-S921N firmware

We do not host firmware. Download it directly from Samsung's servers with a free open-source tool, for example samloader:

samloader download -m SM-S921N -r KOO

Replace KOO with your region code. Step-by-step instructions, including a graphical alternative: How to download Samsung firmware.