SM-L3550 firmware

Stock firmware and official updates for the Samsung Galaxy Watch9 (SM-L3550), by region.

Model code: SM-L3550
Released: Jul 2026
Latest build: L3550ZCS1AZH4
Newest Android: Wear OS 7
Regions: 1 CSCs · 1 countries

Firmware by region All SM-L3550 firmware

SM-L340 SM-L350 SM-L345F SM-L355F SM-L345N SM-L355N SM-L345U SM-L355U

Software support

Update policyQuarterly security updatesOn Samsung's current security update list

Security updates untilJul 31, 2031As published by Samsung

Latest official updateWear OS 7L3550ZCS1AZH4 · Aug 31, 2026

Security patch levelAugust 2026Monthly release fixed 63 vulnerabilities

Latest SM-L3550 firmware by region

Full firmware list →

RegionBuildAndroidSecurity patchDateDetails

China CHCBuildL3550ZCS1AZH4AndroidWear OS 7Security patchAug 2026ReleasedAug 31, 2026DetailsWhat's new

SM-L3550 update history

Latest Aug 31, 2026

Samsung's official release notes, newest first.

Aug 31, 2026L3550ZCS1AZH4Wear OS 7 · August 2026 patch

• Security The device is protected with improved security. These changes may vary depending on the model, country, or network operator of the customer environment.

Released for 1 CSC: CHC

Source: Samsung

Jul 7, 2026L3550ZCU1AZG1Wear OS 7 · May 2026 patch

· Device stability improvements, bug fixes. · New and / or enhanced features. · Further improvements to performance.

Released for 1 CSC: CHC

Source: Samsung

Specifications

Taken from the SM-L355F; this model can differ (chipset, network bands).

Display

Display size: 1.5" (37.3mm)
Resolution: 480 x 480
Display type: Super AMOLED

Platform

CPU speed: 2.1GHz, 1.95GHz
CPU cores: Penta-Core

Memory

RAM: 2 GB
Storage: 32 GB

Battery

Battery: 445 mAh

Body

Dimensions: 46.0 x 43.7 x 8.6 mm

Connectivity

Wi-Fi: 802.11a/b/g/n 2.4GHz+5GHz
Bluetooth: Bluetooth v6.0
NFC: Yes
Positioning: GPS, Glonass, Beidou, Galileo, QZSS

Software

Security updates until: 31 July 2031