SM-A366U1 11 countries Android 16

Samsung Galaxy A36 5G A366U1UES4BYK3 Firmware

Samsung Galaxy A36 5G A366U1UES4BYK3 is an Android 16 firmware for 11 countries, 21 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 A366U1UEU3BYI7: bootloader binary raised from 3 to 4, so after installing it there is no way back to older builds; security patch 2025-11-01 instead of 2025-09-01. A newer build for SM-A366U1 is available: A366U1UEUADZIF.

OS updates guaranteed until: Android 21Security updates until: Mar 26, 2031
9.3/10 (39)4,720 times
Android 16
OS Version
2025-11-13
First release
other regions until 2025-11-15
2025-11-01
Security patch
11
Countries
21
CSC codes
4
Bootloader binary

Bootloader binary 4. Flashing firmware with a lower binary is usually blocked by Samsung anti-rollback.

Newer builds of Samsung Galaxy A36 5G use bootloader binary A (10) (latest: A366U1UEUADZIF). If your device already runs binary A (10), this build cannot be flashed.

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#.
    Your CSC is in Settings → About phone (About tablet) → Software information, or dial *#1234#. The CSC sets your region's features and network bands. Download the firmware for your country.
    2
    MODEM/CP Version: A366U1UES4BYK3
    ModelRegionCSC VersionBuild DateRelease dateSizeFile nameDownload
    SM-A366U1
    ACG, AIO, ATT, CCT, LRA, TMB, TMK, USC, VZW, XAA, XAR United States
    ATC, CHA, DSA, DSG, DSH, FKR, TFV, XAG
    		A366U1OYM4BYK3 2025-11-13 2025-11-21 7.753 GiB
    SM-A366U1_2_20251113123500_cw3eqxjwig_fac.zip
    SM-A366U1
    PCT Puerto Rico
    LLA
    		A366U1OWA4BYK3 2025-11-15 2025-11-27 7.898 GiB
    SM-A366U1_2_20251115062510_mq0i02pwpk_fac.zip

    No matching downloads

    How to flash A366U1UES4BYK3

    • A366U1UES4BYK3 has bootloader binary 4. Your device must run binary 4 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 A366U1UES4BYK3

    • 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: November 2025

    SMR Nov-2025 fixes 33 vulnerabilities, 2 of them critical. Android Security Bulletin: 24, Samsung Semiconductor: 5, Samsung-specific issues (SVE): 4.

    Most severe Samsung fixes:

    • high Out-of-bounds write in handling opcode in fingerprint trustlet (CVE-2025-21071)
    • high Out-of-bounds read in libimagecodec.quram.so (CVE-2025-21074)
    • high Out-of-bounds write in libimagecodec.quram.so (CVE-2025-21075)

    All fixes and Galaxy models with this patch

    Rollout of A366U1UES4BYK3 by region

    First release
    November 21, 2025
    Last region
    November 28, 2025
    Duration
    8 days
    Regions
    21
    1. Day 1 · · 19 regions
      United StatesACGAIOATTCCTLRATMBTMKUSCVZWXAAXARATCCHADSADSGDSHFKRTFVXAG
    2. Day 7 · · 1 region
      LLA
    3. Day 8 · · 1 region
      Puerto RicoPCT

    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

    A366U1UES4BYK3 is Android 16 firmware for Samsung Galaxy A36 5G, released for 11 countries, 21 CSC codes. It includes the 2025-11-01 security patch. Samsung built it on 2025-11-13.

    SMR Nov-2025 fixes 33 vulnerabilities, 2 of them critical. Android Security Bulletin: 24, Samsung Semiconductor: 5, Samsung-specific issues (SVE): 4.

    No. A newer build for SM-A366U1 is available: A366U1UEUADZIF. Install it instead of A366U1UES4BYK3 unless you need this exact version. The previous build was A366U1UEU3BYI7.

    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 4 or lower.

    This build uses bootloader binary 4. It can be flashed on a Samsung Galaxy A36 5G running binary 4 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". No other build of this model uses binary 4.

    Other builds and changelog for Samsung Galaxy A36 5G

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    Warranty and care
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    • 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.

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    Model firmware by region