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The latest officially documented firmware record found for a Samsung Galaxy Watch3 45mm is R845FXXU1FWK2, running Tizen 5.5.0.2. Samsung lists it for the SM-R845F, the international 45mm LTE variant, with a release date of December 26, 2023.
This is not a universal firmware number for every 45mm Watch3. Availability depends on the watch’s exact model, country, carrier and CSC. Check Galaxy Wearable—or the watch itself—for the update that applies to your device.
Latest Galaxy Watch3 45mm firmware
| Detail | Latest documented record |
|---|---|
| Model | SM-R845F |
| Watch | Galaxy Watch3 45mm LTE, international variant |
| Firmware build | R845FXXU1FWK2 |
| Platform version | Tizen 5.5.0.2 |
| Release date | December 26, 2023 |
| Changes | Stretched Time and Perpetual watch faces, plus improved sensor stability |
Samsung’s official SM-R845F update history documents this release. Samsung also notes that update availability and changes can vary by model, country and service provider.
Identify your exact 45mm model
“45mm” identifies the case size, not the firmware variant. On the watch, open Settings → About watch and record the model number, software version and any service-provider or CSC information shown.
#1 Best Overall
- Galaxy Watch3 combines powerful technology with a premium, customizable design so you can manage the day-today from your wrist, beautifully.
- Keep an eye on wellness with advanced health monitoring, and go for days without charging.
- Keep an eye on your fitness and health with SpO2, VO2 max, and heart-rate monitoring. Help is just a tap away if you stumble. And track your cycle in an easy and discreet way. *This device and related software are not intended for use in the diagnosis of disease or other conditions, or in the cure, mitigation, treatment or prevention of disease. SPO2, VO2 max and running coach features not available at the time of launch, will become available during Q3. Features will require a software update.
- Galaxy Watch3 combines style—two sizes, three colors, 50,000-plus watch faces and premium leather bands—with military-grade durability and water resistance.
- Spend your time moving while Galaxy Watch3 tracks seven popular activities automatically. Get more out of each movement thanks to a built-in run coaching.
| Watch configuration | Typical model |
|---|---|
| 45mm Bluetooth/Wi-Fi | SM-R840 |
| 45mm LTE, U.S. | SM-R845U |
| 45mm LTE, international | SM-R845F |
| 45mm LTE, other regions | SM-R845N, SM-R8450 and related regional variants |
Do not use the 45mm LTE firmware on a Bluetooth model or a different regional/carrier variant unless Samsung specifically identifies it as compatible. The Samsung Knox device list separates the 45mm SM-R840/SM-R845 family from the 41mm SM-R850 and SM-R855 models.
What the latest documented update adds
For SM-R845F, build R845FXXU1FWK2 adds two watch faces:
- Stretched Time
- Perpetual
It also improves sensor stability. The watch remains on Tizen 5.5.0.2; this is not a migration to Wear OS.
The preceding documented build, R845FXXU1FVH4, was dated September 28, 2022. Its listed changes included two watch faces, improved Daily Activity Indicator synchronization, snoring recording using the paired phone, and Samsung Health Monitor ECG and blood-pressure support where regulatory approval existed.
ECG and blood-pressure functions are not guaranteed in every country merely because the software or Samsung Health Monitor components are present. Activation depends on market availability and regulatory approval.
Update through Galaxy Wearable on Android
- Charge the watch. Samsung says an update may not be available when the battery is below 30%.
- Open Galaxy Wearable on the connected Android phone.
- Tap Watch settings.
- Tap Watch software update.
- Tap Download and install.
- Allow the watch to reboot and finish the progress screen.
Keep the phone and watch connected, use a stable internet connection, and do not power off or disconnect the watch during installation. Samsung’s labels can vary by device and software version; its current instructions are available on the Galaxy Watch software-update support page.
Rank #2
- Galaxy Watch3 combines powerful technology with a premium, customizable design so you can manage the day-today from your wrist, beautifully.
- Keep an eye on wellness with advanced health monitoring, and go for days without charging.
- Keep an eye on your fitness and health with SpO2, VO2 max, and heart-rate monitoring. Help is just a tap away if you stumble. And track your cycle in an easy and discreet way. *This device and related software are not intended for use in the diagnosis of disease or other conditions, or in the cure, mitigation, treatment or prevention of disease. SPO2, VO2 max and running coach features not available at the time of launch, will become available during Q3. Features will require a software update.
- Galaxy Watch3 combines style—two sizes, three colors, 50,000-plus watch faces and premium leather bands—with military-grade durability and water resistance.
- Spend your time moving while Galaxy Watch3 tracks seven popular activities automatically. Get more out of each movement thanks to a built-in run coaching.
If the screen says Latest version installed, Samsung means that no newer update is currently available for that particular device and configuration.
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Update directly on the watch
If the Watch3 was configured without a phone, use this path:
- Press the watch’s Home/Power button.
- Open Settings.
- Tap General.
- Tap Watch software update.
- Confirm the download or installation when prompted.
These are Tizen Watch3 instructions. Do not substitute guides for newer Galaxy Watch models, which use Wear OS and may show different menus.
Update Watch3 apps separately
Firmware updates and watch-app updates are separate.
With an Android phone
- Open Galaxy Store.
- Tap Menu, then Updates.
- Select the Watch tab.
- Tap Update all, or update individual apps.
The Watch tab appears when the watch is connected through Galaxy Wearable.
Without a phone
- Open Galaxy Store on the watch.
- Tap the three-dot More options menu.
- Tap Update.
- Tap Update all.
The update option may not appear until you sign in with a Samsung account.
Rank #3
- STYLE YOU CAN COUNT ON: Galaxy Watch3 combines style—two sizes, two finishes, three colors and, 50,000 plus¹ watch faces-with military-grade durability² and water resistance³.
- LEAVE YOUR PHONE BEHND: Galaxy Watch3 gives you the freedom to call, text, stream music and get notifications via Bluetooth connectivity.
- HOLISTIC HEALTH MONITORING: Use your Galaxy watch to record ECG for 30 seconds similar to a standard single-lead ECG. ⁴(All ECG functionality requires compatible Galaxy smartphone. ⁴) The ECG Monitor app will also check the recording for signs of Atrial Fibrillation— a common form of irregular heart rhythm. ⁴You can share the PDF report of your ECG recording with your health care provider using the Samsung Health Monitor app on your compatible Galaxy phone.
- BATTERY BUILT FOR ENDURANCE: The Galaxy Watch3’s long-lasting battery can go for more than a day ⁵on a single charge, and you can always get a quick boost from your compatible Galaxy phone with Wireless Power Share⁶.
- STRONGER INSIGHTS. NEXT-LEVEL FITNESS: Spend your time moving while Galaxy Watch3 tracks seven popular activities automatically. Get more out of each movement thanks to built-in run coaching⁷.
Why your watch may show a different version
- Different model suffix: SM-R840, SM-R845U, SM-R845F and other regional versions receive different packages.
- Country, carrier or CSC: LTE watches can have carrier-specific software and rollout schedules.
- Staged availability: A build documented by Samsung may not yet be offered over the air to every eligible watch.
- Connection or battery problems: An outdated Galaxy Wearable app, disconnected pairing, unstable network or low charge can prevent the check.
- Stale third-party listings: Firmware archives may show an older regional record rather than the latest Samsung-published history.
Use the evidence in this order: the watch’s own update screen, Samsung’s model-specific update history, Samsung’s regional support page, reputable archives and finally community reports. The visible SamMobile listing, for example, shows the older FVH4 record even though Samsung documents the later FWK2 release for SM-R845F.
What to do if the update fails
- Place the watch on its charger and retry.
- Restart both the watch and the phone.
- Confirm that the watch remains paired in Galaxy Wearable.
- Update Galaxy Wearable and relevant Samsung watch components.
- Retry using a reliable Wi-Fi connection.
- Free storage if the watch reports insufficient space.
- Do not disconnect or power off the watch while installation is running.
If the watch enters a boot loop, follow Samsung’s recovery guidance or contact Samsung support before resetting it. Samsung notes that recovery from a failed update may require removing the app or performing a factory reset. A factory reset is a last resort because it erases watch data.
Should you manually flash firmware?
For normal updating, use official over-the-air installation through Galaxy Wearable or the watch’s software-update menu. Manual flashing introduces avoidable risks:
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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →- Installing firmware for the wrong model can make the watch unusable.
- 41mm SM-R850/SM-R855 firmware is not a substitute for 45mm firmware.
- Carrier and regional packages may not be interchangeable.
- Random “repair firmware” files may be incomplete, modified or unsuitable.
- A firmware archive’s newest visible entry does not prove that Samsung approved it for your country or CSC.
SamMobile itself recommends Samsung’s official update utilities and warns that flashing can damage the device. Use an archive for historical identification, not as proof that a file is safe to install.
Verify the result after updating
After installation, return to Settings → About watch and confirm the installed software version and build. If your model is not SM-R845F, compare the result with the update offered directly for your watch rather than expecting R845FXXU1FWK2.
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