SM-L305N 1 country Android 16

Samsung Galaxy Watch7 L305NKOS3BZF4 Firmware

Name: Samsung Galaxy Watch7 (SM-L305N)
Brand: Samsung
Availability: InStock

Samsung Galaxy Watch7 L305NKOS3BZF4 is an Android 16 firmware for South Korea (KOO, SKC). It is the same firmware configured per region and carrier (CSC). Find your country below, verify the file and download for free. Compared with the previous build L305NKOS3BZE1, Android and the bootloader binary are unchanged, so you can switch between the two in both directions. This is the newest build for SM-L305N.

8.9/10 (70)988 times

Android 16

OS Version

2026-07-09

Build Date

n/a

Security patch

Countries

CSC codes

Bootloader binary

Bootloader binary 3. Flashing firmware with a lower binary is usually blocked by Samsung anti-rollback.

All regional downloads

Pick your region (CSC) to download the matching firmware package.

Will it work on my device?

Paste your current build number from Settings > About phone (About tablet) > Software information, or the output of *#1234#.

MODEM/CP Version: L305NKOS3BZF4

Model	Region	CSC Version	Size	File name	Download
SM-L305N	KOO South Korea	L305NOKO3BZF4	3.551 GiB	SM-L305N_2_20260709064340_j1mvojjg5n_fac.zip
SM-L305N	SKC South Korea	L305NOKA3BZF4	3.557 GiB	SM-L305N_2_20260709064250_1wk3ia7a5p_fac.zip

Device specifications

Launched withWear OS
Display diagonal3.3 cm (1.3")
Display technologyAMOLED
Display resolution432 x 432 pixels
RAM2 MB
Battery capacity300 mAh
Weight28.8 g
Band colourGreen
Band sizeS/M

Specifications of SM-L305F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

How to flash L305NKOS3BZF4

Install Samsung USB Drivers:Download Official Drivers
Download Odin Flash Tool:

L305NKOS3BZF4 has bootloader binary 3. Your device must run binary 3 or lower: it is the 5th character from the end of your current build number.
CSC: Use CSC for a clean install, to change the region (CSC code), to downgrade or to repair a device that does not boot.
HOME_CSC: Use HOME_CSC to update the same model and region while keeping your data. Back up anyway: a failed update can still require a reset.
The Download Mode key combo depends on the model: see all combos.

Full flashing guide

Beware: Manually flashing firmwares may brick your device. Use it at your own risk and follow our tutorial steps.

Frequently Asked Questions

L305NKOS3BZF4 is Android 16 firmware for Samsung Galaxy Watch7, released for South Korea (KOO, SKC). Samsung built it on 2026-07-09.

Yes. L305NKOS3BZF4 is the newest build for SM-L305N on SamFirm. The previous build was L305NKOS3BZE1.

Download the package for your region (CSC) and unzip it. In Odin, load each file into the slot with the same name: BL, AP, CP (if the package has one) and CSC, or HOME_CSC to keep your data. Odin checks the built-in checksum of every .tar.md5 file before flashing. The Samsung Galaxy Watch7 must be on bootloader binary 3 or lower.

This build uses bootloader binary 3. It can be flashed on a Samsung Galaxy Watch7 running binary 3 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 2 other builds of this model use the same binary, so you can switch between them in both directions.