Galaxy Watch4

Download Samsung Firmware SM-R865F

Samsung Galaxy Watch4

The latest firmware for Samsung Galaxy Watch4 (SM-R865F) is R865FXXS2JZG3 with Android 16, released on August 24, 2026 for 21 regions (CSC). Every official firmware build for SM-R865F, newest first: one row per build with all regions (CSC) that received it.

Latest build
R865FXXS2JZG3 https://samfirm.shop/build/R865FXXS2JZG3 Android 16 · 2 months ago
Builds
23 builds
Regions (CSC)
21 regions

Firmware builds for SM-R865F

Each firmware build has its own page at https://samfirm.shop/build/{PDA}, where {PDA} is the build number from the list above. Example: https://samfirm.shop/build/R865FXXS2JZG3

SM-R865F update history

SM-R865F started on Android 11 and has received 3 major Android upgrades; it now runs Android 16. The newest build, R865FXXS2JZG3, was released on August 24, 2026 with the August 2026 security patch. That patch (SMR Aug-2026) fixes 54 vulnerabilities, 8 of them critical. Over the last 12 months SM-R865F received 5 builds, spread over 5 different months.

Device specifications

Launched with
Wear OS
Display diagonal
3.05 cm (1.2")
Display technology
OLED
Display resolution
396 x 396 pixels
Processor frequency
1180 MHz
RAM
1500 MB
Flash memory
16 GB
Battery capacity
247 mAh
Weight
25.9 g
Band colour
Black

Changelog for SM-R865F

https://samfirm.shop/build/R865FXXS2JZG3

• Security
The device is protected with improved security.

These changes may vary depending on the model, country, or network operator of the customer environment.

• Stability and reliability
Device behavior has been improved.
• Security
The device is protected with improved security.

These changes may vary depending on the model, country, or network operator of the customer environment.

One UI 8 Watch Upgrade
Get things done

Stay on top of important tasks with the Now bar
Check the information you need right now and start essential features straight from your watch face. Ongoing tasks will appear in the Now bar at the bottom of your watch face so you can check key information quickly.

Do more with double pinch
Just pinch your thumb and index finger together twice to scroll through notifications, control music, take pictures, and more. You can also customize what happens wh...

• Stability and reliability
Device behavior has been improved.

These changes may vary depending on the model, country, or network operator of the customer environment.

• Stability and reliability
The stability has been improved.
• Security
The device is protected with improved security.

Show 21 older builds
One UI 6 Watch Upgrade
A new look for your watch

Discover new watch faces
Express your individual style with these new premium watch faces. Spatial Number provides an analog clock on top of large bold digits. Simple Digital is for people who prefer a minimalist design. Ultra Info Board lets you quickly check your workout information. You can find these watch faces in the new featured watch faces section of the Galaxy Wearable app. You can also browse watch faces by keyword including colors,...

• Workout Tracker Support
By connecting your Galaxy Watch to your Samsung TV, you can view workout data from your watch on your TV screen.
※ Supported products and connection requirements
. Supports Samsung TV/Smart Monitor/Projector/Life Style products that are newly released from 2024. However, this may vary depending on Samsung policy.
. It is supported on the condition that the same Samsung account is registered on both the Samsung TV and the Galaxy Watch.
. For more information, please v...

• Added the new Samsung Health Monitor App(Blood Pressure and ECG).
* Available on Galaxy smartphones with Android 9.0 and later.
※ The Blood Pressure app and/or ECG app in the Samsung Health Monitor is available in countries where a regulatory clearance, approval or certificate for each app has been obtained.
We expect that the number of countries where the Samsung Health Monitor to be available will continuously increase in the order of securing an appropriate regulatory clearance, approval or...

https://samfirm.shop/build/R865FXXU1HWH3
One UI 5 Watch Upgrade

Watch faces and tiles

• Add watch faces and tiles more easily
A new vertical layout makes it easier to find the watch faces and tiles that are right for you.

• Check the battery level of all your devices
The new Battery tile lets you quickly check the battery level of your watch, phone, and Galaxy Buds.

• Improved Buds controller tile
You can now turn 360 audio on and off from the Buds controller tile if your Buds support 360 audio.

• Quick access to timers
You can st...

• Security
The device is protected with improved security.

• Samsung Health
The application will be updated to the latest version.
• Improved system stability and reliability
The stability has been improved.

• Stability and reliability
The stability has been improved.

• New Camera Controller feature added
Change zoom on your phone camera remotely through pinching in or out on the screen, or through rotating the bezel.
※ This feature is only supported on flagship models released after Samsung Galaxy S20 or Z Flip running at least One UI 5.1.
• Samsung Members
A new “Connected device diagnostics” option has been added to check the proper performance of the Galaxy Watch's battery status, touch screen function, etc. on the connected phone.
※ Please update Samsung...

• Watch Face
Newly designed Ball Watch face is added.
• Stability and reliability
Stability codes applied to improve notifications and device behavior.

• Watch Face
Enjoy new and improved watch faces with enriched style and customizable options.
- 6 new watch faces
  (Pebbles, Flower garden, Info Board, Pro analog, Kinetic digits, Gradient number)
- More customizable options added for existing watch faces
  (Dial, Indexes, Character, Color, Complication, Clock type)
- New complications have been added.
• Watch home screen
- Add watch faces as your favorite, make finding and changing watch face easier.
- Explore watch face list to add wat...

• Improved system stability and reliability
Stabilization codes for watch operation have been applied.

• Enhanced Samsung Health Function
• Improved system stability and reliability

• Live Wallpaper Watch face update with Galaxy S22's Wallpaper.
• New Watch faces have been added to match the new bands.
• More customization options, such as colors and clock fonts, have been added to existing Watch faces.
• Provides information on moisture loss and intake required after outdoor running exercises for body balance and exercise efficiency.
• Supports Interval Training for Running and Cycling Exercises. Make a more systematic exercise plan with Galaxy Watch!
• When you're done ex...

• Added the new Samsung Health Monitor App for ECG measurements.
※ Available on Galaxy smartphones with Android 7.0 and later

• Watch faces
- Supports 4 types of new Watch faces.
- Together, AR Emoji, Bitmoji Watch face: Usability was improved.
- My Photo Watch face: Supports GIF files.
- Animal, Cute Character Watch face: Customization feature was improved.
- Supports the backup and restoration of the order of Watch faces and the changed settings of the preloaded Watch faces.
• S Health
- An improved HR measurement accuracy algorithm was added.
- The sensitivity option in the Fall Detection feature was added.
•...

• Improved usability of the following applications or features: Touch bezel
• Improved system stability and reliability

• Improved system stability and reliability
  • R865FXXU1BUHA Sep 8, 2021
  • R865FXXU1BUHB Sep 7, 2021
  • R865FXXU1BUH9 Aug 24, 2021
1 retail code (SKU)

Box codes of SM-R865F for different colors and markets. Firmware is chosen by the model code SM-R865F and your region (CSC), not by the SKU.

  • SM-R865FZKAEUA

Similar Models

Frequently Asked Questions

What is the latest Android version for SM-R865F?

The newest firmware for SM-R865F runs Android 16: build R865FXXS2JZG3, released on August 24, 2026.

When did SM-R865F get its last update?

The latest build for SM-R865F, R865FXXS2JZG3, was released on August 24, 2026 (2 months ago).

How often does SM-R865F get updates?

Over the last 12 months SM-R865F received 5 builds, with at least one new build in 5 different months.

Is the firmware for SM-R865F official?

Yes, all firmware files for SM-R865F are 100% official, original, and obtained directly from Samsung servers.

How to flash Samsung SM-R865F using Odin?

To flash SM-R865F, you need to download the appropriate firmware, put your device into Download Mode, and use the Odin tool to load the BL, AP, CP, and CSC files.

Can I downgrade the Android version on SM-R865F?

Downgrading is only possible if the bootloader version (binary bit) of the old firmware matches the current one. Always check the binary version before flashing SM-R865F.