SM-S921N 1 country Android 15

Samsung Galaxy S24 S921NKSS7BYE9 Firmware

Name: Samsung Galaxy S24 (SM-S921N)
Brand: Samsung
Availability: InStock

Samsung Galaxy S24 S921NKSS7BYE9 is an Android 15 firmware for South Korea (KOO, KTC, LUC, SKC). It is the same firmware configured per region and carrier (CSC). Find your country below, verify the file and download for free. Compared with the previous build S921NKSS6BYDF: bootloader binary raised from 6 to 7, so after installing it there is no way back to older builds. A newer build for SM-S921N is available: S921NKSSIEZJ1.

OS updates guaranteed until: Android 21Security updates until: Jan 23, 2031

8.8/10 (276)6,744 times

Android 15

OS Version

2025-06-12

Build Date

n/a

Security patch

Countries

CSC codes

Bootloader binary

Bootloader binary 7. Flashing firmware with a lower binary is usually blocked by Samsung anti-rollback.

Newer builds of Samsung Galaxy S24 use bootloader binary I (18) (latest: S921NKSSIEZJ1). If your device already runs binary I (18), this build cannot be flashed.

All regional downloads

Pick your region (CSC) to download the matching firmware package.

Will it work on my device?

Paste your current build number from Settings > About phone (About tablet) > Software information, or the output of *#1234#.

MODEM/CP Version: S921NKSS7BYE9

Model	Region	CSC Version	Release date	Size	File name	Download
SM-S921N	KOO, KTC, LUC, SKC South Korea	S921NOKR7BYE9	2025-06-12	11.589 GiB	SM-S921N_2_20250528112211_s34zf12mc9_fac.zip

Device specifications

Launched withAndroid 14
Display diagonal15.8 cm (6.2")
Display resolution2340 x 1080 pixels
RAM8 GB
RAM typeLPDDR5X
Rear camera resolution50 MP
Rear camera typeTriple camera
Battery capacity4000 mAh
Weight167 g

Specifications of SM-S921B, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

How to flash S921NKSS7BYE9

Install Samsung USB Drivers:Download Official Drivers
Download Odin Flash Tool:

S921NKSS7BYE9 has bootloader binary 7. Your device must run binary 7 or lower: it is the 5th character from the end of your current build number.
CSC: Use CSC for a clean install, to change the region (CSC code), to downgrade or to repair a device that does not boot.
HOME_CSC: Use HOME_CSC to update the same model and region while keeping your data. Back up anyway: a failed update can still require a reset.
The Download Mode key combo depends on the model: see all combos.

Full flashing guide

Beware: Manually flashing firmwares may brick your device. Use it at your own risk and follow our tutorial steps.

Frequently Asked Questions

S921NKSS7BYE9 is Android 15 firmware for Samsung Galaxy S24, released for South Korea (KOO, KTC, LUC, SKC). Samsung built it on 2025-06-12.

No. A newer build for SM-S921N is available: S921NKSSIEZJ1. Install it instead of S921NKSS7BYE9 unless you need this exact version. The previous build was S921NKSS6BYDF.

Download the package for your region (CSC) and unzip it. In Odin, load each file into the slot with the same name: BL, AP, CP (if the package has one) and CSC, or HOME_CSC to keep your data. Odin checks the built-in checksum of every .tar.md5 file before flashing. The download is 11.589 GiB; keep about twice that free on the computer to unzip it. The Samsung Galaxy S24 must be on bootloader binary 7 or lower.

This build uses bootloader binary 7. It can be flashed on a Samsung Galaxy S24 running binary 7 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". No other build of this model uses binary 7.