SM-R875N 3 countries Android 16

Samsung Galaxy Watch4 R875NKOU1EYK4 Firmware

Name: Samsung Galaxy Watch4 (SM-R875N)
Brand: Samsung
Availability: InStock

Samsung Galaxy Watch4 R875NKOU1EYK4 is an Android 16 firmware for LUO, SKO, South Korea (KOO, KTC, KTO, 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 R875NKOU1DYI1 https://samfirm.shop/build/R875NKOU1DYI1: Android updated from Android 14 to Android 16. A newer build for SM-R875N is available: R875NKOS2EZG3 https://samfirm.shop/build/R875NKOS2EZG3.

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Android 16

OS Version

2025-12-15

Build Date

n/a

Security patch

Countries

CSC codes

Bootloader binary

Bootloader binary 1. Flashing firmware with a lower binary is usually blocked by Samsung anti-rollback.

Newer builds of Samsung Galaxy Watch4 use bootloader binary 2 (latest: R875NKOS2EZG3). If your device already runs binary 2, 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: R875NKOU1EYK4

Model	Region	CSC Version	Size	File name	Download
SM-R875N	KOO South Korea	R875NOKO1EYK4	3.142 GiB	SM-R875N_3_20251215145851_0t62xvwil2_fac.zip
SM-R875N	KTC, KTO, LUC, SKC South Korea LUO, SKO	R875NOKA1EYK4	3.154 GiB	SM-R875N_3_20251215145841_n6prsncpso_fac.zip

Device specifications

Launched withWear OS
Display diagonal3.56 cm (1.4")
Display technologyOLED
Display resolution450 x 450 pixels
RAM1500 MB
Flash memory16 GB
Battery capacity361 mAh
Weight30.3 g
Band colourSilver

Specifications of SM-R875F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

How to flash R875NKOU1EYK4

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

R875NKOU1EYK4 has bootloader binary 1. Your device must run binary 1 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

R875NKOU1EYK4 is Android 16 firmware for Samsung Galaxy Watch4, released for LUO, SKO, South Korea (KOO, KTC, KTO, LUC, SKC). Samsung built it on 2025-12-15.

No. A newer build for SM-R875N is available: R875NKOS2EZG3. Install it instead of R875NKOU1EYK4 unless you need this exact version. The previous build was R875NKOU1DYI1.

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 Samsung Galaxy Watch4 must be on bootloader binary 1 or lower.

This build uses bootloader binary 1. It can be flashed on a Samsung Galaxy Watch4 running binary 1 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 6 other builds of this model use the same binary, so you can switch between them in both directions.