Samsung Watch9 40mm (SM-L340) Firmware Overview
What is the latest SM-L340 firmware?
L340XXS1AZH4, released September 2, 2026 with Android 17. It is a security update on bootloader binary 1. The archive holds 20 official builds across 13 regions (CSC).
Is the Samsung Watch9 40mm still getting updates?
Yes. The newest build is from September 2026, and 1 of 13 regions already have a build from that month; the rest usually follow within a few weeks.
Can I downgrade the SM-L340 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-L340 firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
L340XXS1AZH4
Security update
|
1 | XJP | 17 |
2026-09-02 | Download |
|
L340ZCS1AZH4
Security update
|
1 | CHC | 17 |
2026-08-31 | Download |
|
L340XXS1AZH4
Security update
|
1 | CAM | 17 |
2026-08-27 | Download |
|
L340XXS1AZH4
Security update
|
1 | ACR | 17 |
2026-08-27 | Download |
|
L340XXS1AZH4
Security update
|
1 | AFR | 17 |
2026-08-27 | Download |
|
L340XXS1AZH4
Security update
|
1 | ATO | 17 |
2026-08-27 | Download |
|
L340XXS1AZH4
Security update
|
1 | BRI | 17 |
2026-08-27 | Download |
|
L340XXS1AZH4
Security update
|
1 | BTU | 17 |
2026-08-27 | Download |
|
L340XXS1AZH4
Security update
|
1 | BVO | 17 |
2026-08-27 | Download |
|
L340XXS1AZH4
Security update
|
1 | ARO | 17 |
2026-08-27 | Download |
|
L340XXS1AZH4
Security update
|
1 | XSG | 17 |
2026-08-27 | Download |
|
L340XXS1AZH4
Security update
|
1 | BGL | 17 |
2026-08-27 | Download |
|
L340XXS1AZH4
Security update
|
1 | AUT | 17 |
2026-08-27 | Download |
|
L340XXU1AZFL
Feature update
|
1 | XSG | 17 |
2026-07-23 | Download |
|
L340ZCU1AZG1
Feature update
|
1 | CHC | 17 |
2026-07-23 | Download |
|
L340XXU1AZFL
Feature update
|
1 | ACR | 17 |
2026-07-23 | Download |
|
L340XXU1AZFL
Feature update
|
1 | ARO | 17 |
2026-07-23 | Download |
|
L340XXU1AZFL
Feature update
|
1 | AFR | 17 |
2026-07-23 | Download |
|
L340XXU1AZFL
Feature update
|
1 | ATO | 17 |
2026-07-23 | Download |
|
L340XXU1AZFL
Feature update
|
1 | AUT | 17 |
2026-07-23 | Download |
Latest SM-L340 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 |
|---|---|---|---|---|
| ACR | L340XXS1AZH4 | 1 | 17 | 2026-08-27 |
| AFR | L340XXS1AZH4 | 1 | 17 | 2026-08-27 |
| ARO | L340XXS1AZH4 | 1 | 17 | 2026-08-27 |
| ATO | L340XXS1AZH4 | 1 | 17 | 2026-08-27 |
| AUT | L340XXS1AZH4 | 1 | 17 | 2026-08-27 |
| BGL | L340XXS1AZH4 | 1 | 17 | 2026-08-27 |
| BRI | L340XXS1AZH4 | 1 | 17 | 2026-08-27 |
| BTU | L340XXS1AZH4 | 1 | 17 | 2026-08-27 |
| BVO | L340XXS1AZH4 | 1 | 17 | 2026-08-27 |
| CAM | L340XXS1AZH4 | 1 | 17 | 2026-08-27 |
| CHC | L340ZCS1AZH4 | 1 | 17 | 2026-08-31 |
| XJP | L340XXS1AZH4 | 1 | 17 | 2026-09-02 |
| XSG | L340XXS1AZH4 | 1 | 17 | 2026-08-27 |
How to Flash SM-L340 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.