Samsung Galaxy Watch4

Released Aug 2021 · 12 model codes · firmware for 291 CSC regions

Display size: 1.2"
RAM: 1.5 GB
Battery: 247 mAh

Download firmware Update history Specifications

Software support

Update policySecurity updates endedLast on Samsung's security update list in Sep 2026

Security updates untilAug 31, 2026As published by Samsung

Latest official updateOne UI 8 Watch · Wear OS 6R860XXS2JZG3 · Aug 25, 2026

Security patch levelAugust 2026Monthly release fixed 63 vulnerabilities

Choose your model

Firmware is specific to the model code. Find yours on the box or in Settings › About phone, then pick it below.

ModelSold inFirmwareLatest build

SM-R860 · Galaxy Watch4 Bluetooth (40mm)Sold in68 countriesFirmware72 CSCs · 2,396 buildsLatest buildR860ZCS2JZG3 · Jul 27, 2026→

Software updates

One UI and Android versions of the Galaxy Watch4, with the first release of each.

Dec 2025
One UI 8 Watch · Wear OS 6
Official release: R865NKOU1EYK4 (SM-R865N)
Nov 2025
Android 16
First firmware build: R860XXU1JYK4 (SM-R860)
Dec 2024
One UI 6 Watch · Wear OS 6
Official release: R860XXU1IXK1 (SM-R860)
Nov 2024
Android 14
First firmware build: R860XXU1IXK1 (SM-R860)
Aug 2023
Android 13
First firmware build: R860TBU1HWH3 (SM-R860)
Jul 2021
Android 11
First firmware build: R860XXXU1AUGC (SM-R860X)

Specifications

As published by Samsung for the SM-R865F; other model codes can differ (chipset, network bands).

Display

Display size: 1.2" (30.4mm)
Resolution: 396 x 396
Display type: Super AMOLED

Platform

CPU speed: 1.18GHz
CPU cores: Dual-Core

Memory

RAM: 1.5 GB
Storage: 16 GB
Card slot: N/D

Battery

Battery: 247 mAh

Body

Dimensions: 40.4 x 39.3 x 9.8 mm

Connectivity

Network: 3G WCDMA,4G LTE FDD
4G bands: B1(2100),B3(1800),B5(850),B7(2600),B8(900),B20(800),B28(700)
SIM: Embedded-SIM
Wi-Fi: 802.11 a/b/g/n 2.4+5GHz
Bluetooth: Bluetooth v5.0

Where it's sold

Sold in 73 countries.

Europe35

Albania
Austria
Azerbaijan
Belgium
Bosnia & Herzegovina
Bulgaria
Croatia
Czechia
Denmark
Estonia
Finland
France
Germany