SM-S731N 1 country Android 17

Samsung Galaxy S25 FE S731NKSSACZJ2 Firmware

Name: Samsung Galaxy S25 FE (SM-S731N)
Brand: Samsung
Availability: InStock

Samsung Galaxy S25 FE S731NKSSACZJ2 is an Android 17 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 S731NKSU9CZIF https://samfirm.shop/build/S731NKSU9CZIF: bootloader binary raised from 9 to A (10), so after installing it there is no way back to older builds. This is the newest build for SM-S731N.

OS updates guaranteed until: Android 23Security updates until: Sep 24, 2032

8.9/10 (26)376 times

Android 17

OS Version

2026-10-07

Build Date

n/a

Security patch

Countries

CSC codes

A (10)

Bootloader binary

Bootloader binary A (10). Flashing firmware with a lower binary is usually blocked by Samsung anti-rollback.

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: S731NKSSACZJ1

Model	Region	CSC Version	Release date	Size	File name	Download
SM-S731N	KOO, KTC, LUC, SKC South Korea	S731NOKRACZJ2	2026-10-19	12.465 GiB	SM-S731N_3_20261007211051_bk7vv56xad_fac.zip

Device specifications

Launched withAndroid 16.0
Display diagonal17 cm (6.7")
Display resolution1080 x 2340 pixels
RAM8 GB
Rear camera resolution50 MP
Rear camera typeTriple camera
Battery capacity4900 mAh
Weight190 g

Specifications of SM-S731B, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

How to flash S731NKSSACZJ2

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

S731NKSSACZJ2 has bootloader binary A (10). Your device must run binary A (10) 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

S731NKSSACZJ2 is Android 17 firmware for Samsung Galaxy S25 FE, released for South Korea (KOO, KTC, LUC, SKC). Samsung built it on 2026-10-07.

Yes. S731NKSSACZJ2 is the newest build for SM-S731N on SamFirm. The previous build was S731NKSU9CZIF.

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 12.465 GiB; keep about twice that free on the computer to unzip it. The Samsung Galaxy S25 FE must be on bootloader binary A (10) or lower.

This build uses bootloader binary A (10). It can be flashed on a Samsung Galaxy S25 FE running binary A (10) 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 A (10).