Samsung Galaxy S23 Ultra S918NKSS6EYK3
SM-S918N 1 country Android 16

Samsung Galaxy S23 Ultra S918NKSS6EYK3 Firmware

Samsung Galaxy S23 Ultra S918NKSS6EYK3 is an Android 16 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 S918NKSS6EYJ7: security patch 2025-11-01 instead of 2025-10-01. A newer build for SM-S918N is available: S918NKSU8GZIF.

OS updates guaranteed until: Android 17Security updates until: Jan 31, 2028
Download firmware
9.0/10 (194)5,268 times
Android 16
OS Version
2025-11-17
Build Date
2025-11-01
Security patch
1
Countries
4
CSC codes
6
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.

Paste your current build number from Settings > About phone (About tablet) > Software information, or the output of *#1234#.
    MODEM/CP Version: S918NKSU6EYI7
    ModelRegionCSC VersionRelease dateSizeFile nameDownload
    SM-S918N
    KOO, KTC, LUC, SKC South Korea
    		S918NOKR6EYK3 2025-11-17 10.306 GiB
    SM-S918N_4_20251107221641_a3pbm9zxx5_fac.zip
    		Download

    No matching downloads

    How to flash S918NKSS6EYK3

    • S918NKSS6EYK3 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.

    Security patch: November 2025

    SMR Nov-2025 fixes 33 vulnerabilities, 2 of them critical. Android Security Bulletin: 24, Samsung Semiconductor: 5, Samsung-specific issues (SVE): 4.

    Most severe Samsung fixes:

    • high Out-of-bounds write in handling opcode in fingerprint trustlet (CVE-2025-21071)
    • high Out-of-bounds read in libimagecodec.quram.so (CVE-2025-21074)
    • high Out-of-bounds write in libimagecodec.quram.so (CVE-2025-21075)

    All fixes and Galaxy models with this patch

    Rollout of S918NKSS6EYK3 by region

    Samsung released this build in all regions (4) on the same day, November 17, 2025.

    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.

    Frequently Asked Questions

    S918NKSS6EYK3 is Android 16 firmware for Samsung Galaxy S23 Ultra, released for South Korea (KOO, KTC, LUC, SKC). It includes the 2025-11-01 security patch. Samsung built it on 2025-11-17.

    SMR Nov-2025 fixes 33 vulnerabilities, 2 of them critical. Android Security Bulletin: 24, Samsung Semiconductor: 5, Samsung-specific issues (SVE): 4.

    No. A newer build for SM-S918N is available: S918NKSU8GZIF. Install it instead of S918NKSS6EYK3 unless you need this exact version. The previous build was S918NKSS6EYJ7.

    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 10.306 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.

    Other builds and changelog for Samsung Galaxy S23 Ultra

    No changelog details available.
    Model firmware by region