SM-A266U1 2 countries Android 15

Samsung Galaxy A26 5G A266U1UES3AYF1 Firmware

Samsung Galaxy A26 5G A266U1UES3AYF1 is an Android 15 firmware for LLA, 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 A266U1UEU2AYD8: bootloader binary raised from 2 to 3, so after installing it there is no way back to older builds; security patch 2025-06-01 instead of 2025-04-01. A newer build for SM-A266U1 is available: A266U1UEUADZJ5.

OS updates guaranteed until: Android 21Security updates until: Mar 2, 2031
Download firmware
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Android 15
OS Version
2025-06-19
Build Date
2025-06-01
Security patch
2
Countries
2
CSC codes
3
Bootloader binary

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

Newer builds of Samsung Galaxy A26 5G use bootloader binary A (10) (latest: A266U1UEUADZJ5). 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#.
    MODEM/CP Version: A266U1UES3AYF1
    ModelRegionCSC VersionRelease dateSizeFile nameDownload
    SM-A266U1
    PCT Puerto Rico
    LLA
    		A266U1OWA3AYF1 2025-07-10 7.164 GiB
    SM-A266U1_1_20250619041240_16c6cxlgis_fac.zip
    		Download

    No matching downloads

    How to flash A266U1UES3AYF1

    • A266U1UES3AYF1 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.

    What's new in A266U1UES3AYF1

    • 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: June 2025

    SMR Jun-2025 fixes 55 vulnerabilities, 0 of them critical. Android Security Bulletin: 36, Samsung Semiconductor: 10, Samsung-specific issues (SVE): 9.

    Most severe Samsung fixes:

    • high Improper access control in fingerprint trustlet (CVE-2025-20987)
    • high Improper logging in fingerprint trustlet (CVE-2025-20989)

    All fixes and Galaxy models with this patch

    Rollout of A266U1UES3AYF1 by region

    Samsung released this build in all regions (2) on the same day, July 10, 2025.

    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
    • Weight200 g

    Specifications of SM-A266B, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

    Frequently Asked Questions

    A266U1UES3AYF1 is Android 15 firmware for Samsung Galaxy A26 5G, released for LLA, Puerto Rico (PCT). It includes the 2025-06-01 security patch. Samsung built it on 2025-06-19.

    SMR Jun-2025 fixes 55 vulnerabilities, 0 of them critical. Android Security Bulletin: 36, Samsung Semiconductor: 10, Samsung-specific issues (SVE): 9.

    No. A newer build for SM-A266U1 is available: A266U1UEUADZJ5. Install it instead of A266U1UES3AYF1 unless you need this exact version. The previous build was A266U1UEU2AYD8.

    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 7.164 GiB; keep about twice that free on the computer to unzip it. The Samsung Galaxy A26 5G must be on bootloader binary 3 or lower.

    This build uses bootloader binary 3. It can be flashed on a Samsung Galaxy A26 5G running binary 3 or lower; if the device already has a higher binary, Odin stops with "SW REV CHECK FAIL". 1 other build of this model uses the same binary, so you can switch between them in both directions.

    Other builds and changelog for Samsung Galaxy A26 5G

    No changelog details available.

    • 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.

    One UI 8.0 (Android 16)
    Productivity

    Check stock prices without unlocking
    Stocks you follow on Google Finance with big price changes will appear on your Now bar at the end of the trading day.

    Easier file sharing with Quick Share
    It's never been easier to send and receive files. Tap the Quick Share button in quick settings to get started. You can receive files while the Quick Share screen is open and send files to others directly from Quick Share.

    Sticky notes
    Add quick annotations on top o...

    Show 5 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.

    • Press and hold the Side button to access Google Gemini
    The Side button is a new way to access Google Gemini or other digital assistant app quickly instead of using the corner swipe. You can change what the Side button does in Settings.
    • Complete multiple tasks with one ask
    Google Gemini is now seamlessly integrated with Samsung apps such as Calendar, Notes, Reminder, and Clock. You can complete tasks in these apps using information from Gemini with one simple command. Try asking Google Gemini...

    • Security
    The device is protected with improved security.

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