Samsung Galaxy A36 5G A366USQSACZH1
SM-A366U 6 countries Android 16

Samsung Galaxy A36 5G A366USQSACZH1 Firmware

Samsung Galaxy A36 5G A366USQSACZH1 is an Android 16 firmware for 6 countries, 12 CSC codes. 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 A366USQS9CZG2: bootloader binary raised from 9 to A (10), so after installing it there is no way back to older builds; security patch 2026-08-05 instead of 2026-07-05. A newer build for SM-A366U is available: A366USQUADZIF.

OS updates guaranteed until: Android 21Security updates until: Mar 26, 2031
8.7/10 (38)2,650 times
Android 16
OS Version
2026-08-14
First release
other regions until 2026-08-17
2026-08-05
Security patch
6
Countries
12
CSC codes
A (10)
Bootloader binary

Bootloader binary A (10). 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#.
    4
    MODEM/CP Version: A366USQSACZH1
    ModelRegionCSC VersionBuild DateRelease dateSizeFile nameDownload
    SM-A366U
    AIO, ATT, CCT, VZW United States
    APP, CHA, DSA, DSG, DSH
    		A366UOYNACZH1 2026-08-14 2026-09-09 8.437 GiB
    SM-A366U_3_20260814200800_iz4bwi8ms5_fac.zip
    SM-A366U
    TMB United States
    		A366UOYNACZH1 2026-08-17 2026-09-08 8.442 GiB
    SM-A366U_3_20260817222841_6041e3it1p_fac.zip
    SM-A366U
    TMK United States
    		A366UOYNACZH1 2026-08-17 2026-09-08 8.442 GiB
    SM-A366U_3_20260817224510_uk6j9p491p_fac.zip
    SM-A366U
    USC United States
    		A366UOYNACZH1 2026-08-17 2026-09-08 8.432 GiB
    SM-A366U_3_20260817225840_7jkypnbspj_fac.zip

    No matching downloads

    How to flash A366USQSACZH1

    • A366USQSACZH1 has bootloader binary A (10). Your device must run binary A (10) 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 A366USQSACZH1

    • 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

    Rollout of A366USQSACZH1 by region

    First release
    September 8, 2026
    Last region
    September 9, 2026
    Duration
    2 days
    Regions
    12
    1. Day 1 · · 3 regions
      United StatesTMBTMKUSC
    2. Day 2 · · 9 regions
      United StatesAIOATTCCTVZWAPPCHADSADSGDSH

    Device specifications

    • Launched withAndroid 15
    • Display diagonal17 cm (6.7")
    • Display resolution1080 x 2340 pixels
    • RAM6 GB
    • Rear camera resolution50 MP
    • Rear camera typeTriple camera
    • Battery capacity5000 mAh
    • Weight195 g

    Specifications of SM-A366B, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

    Frequently Asked Questions

    A366USQSACZH1 is Android 16 firmware for Samsung Galaxy A36 5G, released for 6 countries, 12 CSC codes. It includes the 2026-08-05 security patch. Samsung built it on 2026-08-14.

    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-A366U is available: A366USQUADZIF. Install it instead of A366USQSACZH1 unless you need this exact version. The previous build was A366USQS9CZG2.

    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 A36 5G must be on bootloader binary A (10) or lower.

    This build uses bootloader binary A (10). It can be flashed on a Samsung Galaxy A36 5G running binary A (10) 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.

    Other builds and changelog for Samsung Galaxy A36 5G

    One UI 9
    Productivity and multitasking

    More customizable quick panel
    You can now rearrange and customize the controls in your quick panel even more than before. You can change the size of the brightness and volume sliders as well as the media player. You can also separate the sound mode button from the volume slider.

    Privacy, security, and device protection

    Warranty and care
    The new Warranty and care menu in settings lets you check your warranty information and access diagnostic checks a...

    • Security
    The device is protected with improved security.

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

    One UI 8.5
    Visual design

    Fresh new look
    One UI seamlessly integrates into your daily routine by combining immersive visuals with meaningful personalization for a more refined and sophisticated design. Transparent blur effects add depth and make content easier to navigate, while floating elements react organically to your workflow for a more focused experience. Through familiar and intuitive data visualization, One UI delivers a design that feels both personal and relatable, helping you focus...

    • Security
    The device is protected with improved security.

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

    · Device stability improvements, bug fixes.
    · New and / or enhanced features.
    · Further improvements to performance.

    Model firmware by region