Samsung Watch9 40mm (SM-L345N) Firmware Overview
What is the latest SM-L345N firmware?
L345NKOU1AZH6, released October 6, 2026 with Android 17. It is a feature update on bootloader binary 1. The archive holds 9 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 40mm still getting updates?
Yes. The newest build is from October 2026, and 1 of 4 regions already have a build from that month; the rest usually follow within a few weeks.
Can I downgrade the SM-L345N 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-L345N firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
L345NKOU1AZH6
Feature update
|
1 | KOO | 17 |
2026-10-06 | Download |
|
L345NKOS1AZH4
Security update
|
1 | KOO | 17 |
2026-08-31 | Download |
|
L345NKOS1AZH4
Security update
|
1 | KTC | 17 |
2026-08-31 | Download |
|
L345NKOS1AZH4
Security update
|
1 | SKC | 17 |
2026-08-31 | Download |
|
L345NKOS1AZH4
Security update
|
1 | LUC | 17 |
2026-08-31 | Download |
|
L345NKOU1AZFL
Feature update
|
1 | KOO | 17 |
2026-07-23 | Download |
|
L345NKOU1AZFL
Feature update
|
1 | KTC | 17 |
2026-07-23 | Download |
|
L345NKOU1AZFL
Feature update
|
1 | SKC | 17 |
2026-07-23 | Download |
|
L345NKOU1AZFL
Feature update
|
1 | LUC | 17 |
2026-07-23 | Download |
Latest SM-L345N 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 | L345NKOU1AZH6 | 1 | 17 | 2026-10-06 |
| KTC | L345NKOS1AZH4 | 1 | 17 | 2026-08-31 |
| LUC | L345NKOS1AZH4 | 1 | 17 | 2026-08-31 |
| SKC | L345NKOS1AZH4 | 1 | 17 | 2026-08-31 |
How to Flash SM-L345N Firmware
Put the Samsung Watch9 40mm 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.