SM-L355N firmware

Stock firmware and official updates for the Samsung Galaxy Watch9 (SM-L355N), by region.

Software support

Update policyQuarterly security updatesOn Samsung's current security update list

Security updates untilJul 31, 2031As published by Samsung

Latest firmwareAndroid 17L355NKOS1AZH4 · built Aug 24, 2026

RegionBuildAndroidSecurity patchDateDetails

South Korea KOOBuildL355NKOS1AZH4AndroidAndroid 17Security patch—BuiltAug 24, 2026DetailsDownload

South Korea KTC

Builds in our firmware catalog, newest first.

BuildAndroidBuiltRegions

L355NKOS1AZH4AndroidAndroid 17BuiltAug 24, 2026Regions4 CSCs

L355NKOU1AZH2AndroidAndroid 17BuiltAug 13, 2026Regions4 CSCs

L355NKOU1AZFLAndroidAndroid 17BuiltJun 26, 2026Regions4 CSCs

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