SM-S918N 1 country Android 15

Samsung Galaxy S23 Ultra S918NKSS6DYG8 Firmware

Name: Samsung Galaxy S23 Ultra (SM-S918N)
Brand: Samsung
Availability: InStock

Samsung Galaxy S23 Ultra S918NKSS6DYG8 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 S918NKSS6DYG1: security patch 2025-08-01 instead of 2025-07-01. A newer build for SM-S918N is available: S918NKSU8GZIF.

OS updates guaranteed until: Android 17Security updates until: Jan 23, 2028

8.9/10 (243)5,299 times

Android 15

OS Version

2025-08-13

Build Date

2025-08-01

Security patch

Countries

CSC codes

Bootloader binary

Bootloader binary 6. Flashing firmware with a lower binary is usually blocked by Samsung anti-rollback.

Newer builds of Samsung Galaxy S23 Ultra use bootloader binary 8 (latest: S918NKSU8GZIF). If your device already runs binary 8, 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: S918NKSS6DYG8

Model	Region	CSC Version	Release date	Size	File name	Download
SM-S918N	KOO, KTC, LUC, SKC South Korea	S918NOKR6DYG8	2025-09-01	10.045 GiB	SM-S918N_3_20250730142341_t3pupk5py8_fac.zip

Device specifications

Display diagonal17.3 cm (6.8")
Display resolution3088 x 1440 pixels
RAM8 GB
Rear camera resolution200 MP
Rear camera typeQuad camera
Battery capacity5000 mAh
Weight233 g

Specifications of SM-S918B, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

How to flash S918NKSS6DYG8

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

S918NKSS6DYG8 has bootloader binary 6. Your device must run binary 6 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

S918NKSS6DYG8 is Android 15 firmware for Samsung Galaxy S23 Ultra, released for South Korea (KOO, KTC, LUC, SKC). It includes the 2025-08-01 security patch. Samsung built it on 2025-08-13.

No. A newer build for SM-S918N is available: S918NKSU8GZIF. Install it instead of S918NKSS6DYG8 unless you need this exact version. The previous build was S918NKSS6DYG1.

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 10.045 GiB; keep about twice that free on the computer to unzip it. The Samsung Galaxy S23 Ultra must be on bootloader binary 6 or lower.

This build uses bootloader binary 6. It can be flashed on a Samsung Galaxy S23 Ultra running binary 6 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 11 other builds of this model use the same binary, so you can switch between them in both directions.