SM-A366U1 1 country Android 16

Samsung Galaxy A36 5G A366U1UESACZI1 Firmware

Samsung Galaxy A36 5G A366U1UESACZI1 is an Android 16 firmware for Puerto Rico (PCT). 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 A366U1UESACZH1: security patch 2026-09-05 instead of 2026-08-05. A newer build for SM-A366U1 is available: A366U1UEUADZIF.

OS updates guaranteed until: Android 21Security updates until: Mar 27, 2031
Download firmware
8.7/10 (23)98 times
Android 16
OS Version
2026-10-09
Build Date
2026-09-05
Security patch
1
Countries
1
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#.
    MODEM/CP Version: A366U1UESACZI1
    ModelRegionCSC VersionRelease dateSizeFile nameDownload
    SM-A366U1
    PCT Puerto Rico
    		A366U1OWAACZI1 2026-10-21 8.245 GiB
    SM-A366U1_3_20261009223310_gpw5qtxqib_fac.zip

    No matching downloads

    How to flash A366U1UESACZI1

    • A366U1UESACZI1 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 A366U1UESACZI1

    • 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: September 2026

    SMR Sep-2026 fixes 80 vulnerabilities, 20 of them critical. Android Security Bulletin: 58, Samsung Semiconductor: 1, Samsung-specific issues (SVE): 21.

    Most severe Samsung fixes:

    • critical Heap-based buffer overflow in DNG decoder of libimagecodec.quram.so prior to SMR Sep-2026 Release 1 allows remote attackers to execute arbitrary code. (CVE-2026-21095)
    • critical Heap-based buffer overflow in JPEG decoder of libimagecodec.quram.so prior to SMR Sep-2026 Release 1 allows remote attackers to execute arbitrary code. (CVE-2026-21096)
    • high Out-of-bounds write in libmdnie.so prior to SMR Sep-2026 Release 1 allows local attackers to execute arbitrary code with system server privilege. (CVE-2026-21087)

    All fixes and Galaxy models with this patch

    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

    A366U1UESACZI1 is Android 16 firmware for Samsung Galaxy A36 5G, released for Puerto Rico (PCT). It includes the 2026-09-05 security patch. Samsung built it on 2026-10-09.

    SMR Sep-2026 fixes 80 vulnerabilities, 20 of them critical. Android Security Bulletin: 58, Samsung Semiconductor: 1, Samsung-specific issues (SVE): 21.

    No. A newer build for SM-A366U1 is available: A366U1UEUADZIF. Install it instead of A366U1UESACZI1 unless you need this exact version. The previous build was A366U1UESACZH1.

    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 8.245 GiB; keep about twice that free on the computer to unzip it. 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

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

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    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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    Show 2 older builds

    • 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
    The device is protected with improved security.

    Model firmware by region