Samsung Galaxy A36 5G A366USQU1AYC1 Firmware
Samsung Galaxy A36 5G A366USQU1AYC1 is an Android 15 firmware for United States (AIO, ATT). It is the same firmware configured per region and carrier (CSC). Find your country below, verify the file and download for free. A newer build for SM-A366U is available: A366USQUADZIF https://samfirm.shop/build/A366USQUADZIF.
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.
| Model | Region | CSC Version | Release date | Size | File name | Download |
|---|---|---|---|---|---|---|
| SM-A366U |
AIO United States | A366UOYN1AYC1 | 2025-04-28 | 7.624 GiB | SM-A366U_1_20250421184311_ylcm08zpp0_fac.zip | Download |
| SM-A366U |
ATT United States | A366UOYN1AYC1 | 2025-05-12 | 7.623 GiB | SM-A366U_1_20250421110241_v0ofhxlo8j_fac.zip | Download |
No matching downloads
How to flash A366USQU1AYC1
- A366USQU1AYC1 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.
What's new in A366USQU1AYC1
· Device stability improvements, bug fixes.
· New and / or enhanced features.
· Further improvements to performance.
Security patch: February 2025
SMR Feb-2025 fixes 38 vulnerabilities, 1 of them critical. Android Security Bulletin: 34, Samsung-specific issues (SVE): 4.
Most severe Samsung fixes:
- high Out-of-bounds write in mPOS TUI trustlet (CVE-2025-20904)
- high Out-of-bounds read and write in mPOS TUI trustlet (CVE-2025-20905)
- high Improper Export of Android Application Components in Settings (CVE-2025-20906)
Rollout of A366USQU1AYC1 by region
- First release
- April 28, 2025
- Last region
- May 12, 2025
- Duration
- 15 days
- Regions
- 2
- Day 1 · · 1 regionUnited StatesAIO
- Day 15 · · 1 regionUnited StatesATT
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
Other builds and changelog for Samsung Galaxy A36 5G
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.
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.
- A366USQSACZI4Sep 21, 2026
- A366USQSACZH1Sep 8, 2026
- A366USQS9CZG2Aug 4, 2026
- A366USQS8CZF1Jun 29, 2026
- A366USQS8CZE3Jun 3, 2026
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.
- A366USQS7BZDBMay 7, 2026
- A366USQS6BZC2Mar 26, 2026
- A366USQS6BZB6Mar 11, 2026
- A366USQS5BZA1Jan 29, 2026
- A366USQS4BYK3Nov 20, 2025
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.
- A366USQS3AYI1Sep 5, 2025
- A366USQS3AYG1Jul 17, 2025
• 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.
· Device stability improvements, bug fixes.
· New and / or enhanced features.
· Further improvements to performance.