SM-L355U firmware

Stock firmware and official updates for the Samsung Galaxy Watch9 (SM-L355U), by region.

Model code: SM-L355U
Released: Jun 2026
Latest build: L355USQS1AZH4
Newest Android: Wear OS 7
Regions: 1 CSCs · 1 countries

Firmware by region All SM-L355U firmware

SM-L340 SM-L350 SM-L345F SM-L355F SM-L345N SM-L355N SM-L345U SM-L3550

Software support

Update policyQuarterly security updatesOn Samsung's current security update list

Security updates untilJul 31, 2031As published by Samsung

Latest official updateWear OS 7L355USQS1AZH4 · Sep 1, 2026

Security patch levelAugust 2026Monthly release fixed 63 vulnerabilities

Latest SM-L355U firmware by region

Full firmware list →

RegionBuildAndroidSecurity patchDateDetails

United States XAABuildL355USQS1AZH4AndroidWear OS 7Security patchAug 2026ReleasedSep 1, 2026DetailsWhat's new

SM-L355U update history

Latest Sep 1, 2026

Samsung's official release notes, newest first.

Sep 1, 2026L355USQS1AZH4Wear 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: XAA

Source: Samsung

Specifications

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

Network: 3G WCDMA, 4G LTE FDD, 4G LTE TDD
4G bands: B34(2010), B38(2600), B39(1900), B40(2300), B41(2500); B1(2100), B2(1900), B3(1800), B4(AWS), B5(850), B7(2600), B8(900), B12(700), B13(700), B14(700), B18(800), B19(800), B20(800), B25(1900), B26(850), B28(700), B66(AWS-3), B71(600)
SIM: Embedded-SIM
Wi-Fi: 802.11a/b/g/n 2.4GHz+5GHz
Bluetooth: Bluetooth v6.0
NFC: Yes