Samsung Watch9 40mm L340ZCS1AZH4
SM-L340 1 country Wear OS 7.0

Samsung Watch9 40mm L340ZCS1AZH4 Firmware

Samsung Watch9 40mm L340ZCS1AZH4 is an Wear OS 7.0 firmware for China (CHC). 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 L340ZCU1AZG1: Android updated from Android 17 to Wear OS 7.0. A newer build for SM-L340 is available: L340XXS1AZH4.

Download firmware
9.2/10 (50)289 times
Wear OS 7.0
OS Version
2026-08-31
Build Date
2026-08-05
Security patch
1
Countries
1
CSC codes
1
Bootloader binary

Bootloader binary 1. 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.

Paste your current build number from Settings > About phone (About tablet) > Software information, or the output of *#1234#.
    MODEM/CP Version: L340ZCS1AZH4
    ModelRegionCSC VersionRelease dateSizeFile nameDownload
    SM-L340
    CHC China
    		L340CHC1AZH4 2026-08-31 3.311 GiB
    SM-L340_1_20260831101251_6ezv793u9f_fac.zip
    		Download

    No matching downloads

    How to flash L340ZCS1AZH4

    • L340ZCS1AZH4 has bootloader binary 1. Your device must run binary 1 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.

    What's new in L340ZCS1AZH4

    • Security
    The device is protected with improved security.

    These changes may vary depending on the model, country, or network operator of the customer environment.

    Security patch: August 2026

    SMR Aug-2026 fixes 54 vulnerabilities, 8 of them critical. Android Security Bulletin: 38, Samsung-specific issues (SVE): 16.

    Most severe Samsung fixes:

    • high Improper access control in Weaver prior to SMR Aug-2026 Release 1 allows local attackers to cause device inoperability. (CVE-2026-21064)
    • high Improper input validation in Galaxy Themes prior to SMR Aug-2026 Release 1 allows physical attackers to launch arbitrary activity. (CVE-2026-21073)

    All fixes and Galaxy models with this patch

    Frequently Asked Questions

    L340ZCS1AZH4 is Wear OS 7.0 firmware for Samsung Watch9 40mm, released for China (CHC). It includes the 2026-08-05 security patch. Samsung built it on 2026-08-31.

    SMR Aug-2026 fixes 54 vulnerabilities, 8 of them critical. Android Security Bulletin: 38, Samsung-specific issues (SVE): 16.

    No. A newer build for SM-L340 is available: L340XXS1AZH4. Install it instead of L340ZCS1AZH4 unless you need this exact version. The previous build was L340ZCU1AZG1.

    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 download is 3.311 GiB; keep about twice that free on the computer to unzip it. The Samsung Watch9 40mm must be on bootloader binary 1 or lower.

    This build uses bootloader binary 1. It can be flashed on a Samsung Watch9 40mm running binary 1 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 3 other builds of this model use the same binary, so you can switch between them in both directions.

    Other builds and changelog for Samsung Watch9 40mm

    • Security
    The device is protected with improved security.

    These changes may vary depending on the model, country, or network operator of the customer environment.

    No changelog details available.
    Model firmware by region