Samsung Galaxy Watch Ultra (SM-L705N) Firmware Overview
What is the latest SM-L705N firmware?
L705NKOS3BZF4, released July 9, 2026 with Android 16. It is a security update on bootloader binary 3. The archive holds 20 official builds across 2 regions (CSC).
Is the Samsung Galaxy Watch Ultra still getting updates?
Yes. The newest build is from July 2026, and 2 of 2 regions already have a build from that month; the rest usually follow within a few weeks.
Which Android versions did it get?
The SM-L705N builds in the archive run Android 14 to 16. The earliest build we have for each version:
- Android 16: L705NKOU1BYFE (Jul 2025), 12 builds in total
- Android 14: L705NKOU1AXK6 (Nov 2024), 6 builds in total
Can I downgrade the SM-L705N firmware?
Only to builds with the same bootloader binary (the Bit column) or higher. In the archive the binary of this model rose from 1 to 3:
- Binary 3 — since Feb 2026
- Binary 2 — since Nov 2025
- Binary 1 — since Nov 2024
A phone already on binary 3 rejects builds with a lower binary in Odin ("SW REV CHECK FAIL"), so it can go back to an earlier Android version only if that version has a binary 3 build. How to read a build number.
All SM-L705N firmware builds
| Build / PDA | Bit | Region (CSC) | Android | Date | Download Link |
|---|---|---|---|---|---|
|
L705NKOS3BZF4
Security update
|
3 | KOO | 16 |
2026-07-09 | Download |
|
L705NKOS3BZF4
Security update
|
3 | SKC | 16 |
2026-07-09 | Download |
|
L705NKOS3BZE1
Security update
|
3 | KOO | 16 |
2026-06-11 | Download |
|
L705NKOS3BZE1
Security update
|
3 | SKC | 16 |
2026-06-11 | Download |
|
L705NKOU2BYK1
Feature update
|
2 | KOO | 16 |
2025-11-27 | Download |
|
L705NKOU2BYK1
Feature update
|
2 | SKC | 16 |
2025-11-27 | Download |
|
L705NKOS1BYH6
Security update
|
1 | KOO | 16 |
2025-08-21 | Download |
|
L705NKOS1BYH6
Security update
|
1 | SKC | 16 |
2025-08-21 | Download |
|
L705NKOU1BYG4
Feature update
|
1 | KOO | 16 |
2025-08-06 | Download |
|
L705NKOU1BYFE
Feature update
|
1 | KOO | 16 |
2025-08-06 | Download |
|
L705NKOU1BYG4
Feature update
|
1 | SKC | 16 |
2025-08-06 | Download |
|
L705NKOU1BYFE
Feature update
|
1 | SKC | 16 |
2025-07-26 | Download |
|
L705NKOU1AYCD
Feature update
|
1 | KOO | 14 |
2025-04-09 | Download |
|
L705NKOU1AYCD
Feature update
|
1 | SKC | 14 |
2025-04-09 | Download |
|
L705NKOU1AXL6
Feature update
|
1 | SKC | 14 |
2024-12-31 | Download |
|
L705NKOU1AXL6
Feature update
|
1 | KOO | 14 |
2024-12-31 | Download |
|
L705NKOU1AXK6
Feature update
|
1 | KOO | 14 |
2024-11-28 | Download |
|
L705NKOU1AXK6
Feature update
|
1 | SKC | 14 |
2024-11-28 | Download |
|
L705NKOU3BZB2
Feature update
|
3 | KOO | — |
N/A | Download |
|
L705NKOU3BZB2
Feature update
|
3 | SKC | — |
N/A | Download |
Latest SM-L705N 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 | L705NKOS3BZF4 | 3 | 16 | 2026-07-09 |
| SKC | L705NKOS3BZF4 | 3 | 16 | 2026-07-09 |
How to Flash SM-L705N Firmware
Put the Samsung Galaxy Watch Ultra 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 3 or higher if your phone is already on the latest firmware. Use HOME_CSC to keep your data, CSC for a full wipe.