Samsung Watch9 44mm (SM-L355N) Firmware Overview
What is the latest SM-L355N firmware?
L355NKOU1AZJ3, released November 5, 2026 with Android 17. It is a feature update on bootloader binary 1. The archive holds 12 official builds across 4 regions (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Watch9 44mm still getting updates?
Yes. The newest build is from November 2026, and 4 of 4 regions already have a build from that month; the rest usually follow within a few weeks.
Can I downgrade the SM-L355N firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. All decodable builds in the archive share binary 1:
- Binary 1 — since Jun 2026
All SM-L355N firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
L355NKOU1AZJ3
Feature update
|
1 | KOO | 17 |
2026-11-05 | Download |
|
L355NKOU1AZJ3
Feature update
|
1 | LUC | 17 |
2026-11-05 | Download |
|
L355NKOU1AZJ3
Feature update
|
1 | KTC | 17 |
2026-11-05 | Download |
|
L355NKOU1AZJ3
Feature update
|
1 | SKC | 17 |
2026-11-05 | Download |
|
L355NKOS1AZH4
Security update
|
1 | KOO | 17 |
2026-08-31 | Download |
|
L355NKOS1AZH4
Security update
|
1 | KTC | 17 |
2026-08-31 | Download |
|
L355NKOS1AZH4
Security update
|
1 | LUC | 17 |
2026-08-31 | Download |
|
L355NKOS1AZH4
Security update
|
1 | SKC | 17 |
2026-08-31 | Download |
|
L355NKOU1AZFL
Feature update
|
1 | KOO | 17 |
2026-07-23 | Download |
|
L355NKOU1AZFL
Feature update
|
1 | KTC | 17 |
2026-07-23 | Download |
|
L355NKOU1AZFL
Feature update
|
1 | LUC | 17 |
2026-07-23 | Download |
|
L355NKOU1AZFL
Feature update
|
1 | SKC | 17 |
2026-07-23 | Download |
Latest SM-L355N Firmware by Region
The newest build for each region (CSC) code. Not sure which region your phone uses? See the CSC code guide.
| Region | Latest build | Bit | Android | Date |
|---|---|---|---|---|
| KOO | L355NKOU1AZJ3 | 1 | 17 | 2026-11-05 |
| KTC | L355NKOU1AZJ3 | 1 | 17 | 2026-11-05 |
| LUC | L355NKOU1AZJ3 | 1 | 17 | 2026-11-05 |
| SKC | L355NKOU1AZJ3 | 1 | 17 | 2026-11-05 |
How to Flash SM-L355N Firmware
Put the Samsung Watch9 44mm into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Pick a build with Bit 1 or higher if your phone is already on the latest firmware. Use HOME_CSC to keep your data, CSC for a full wipe.