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). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
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.