Galaxy A26 5G SM-A266U firmware

The latest stable build is A266USQUADZJ5 (Android 17, feature update), first released on Oct 26, 2026 – 11 days ago. Samsung has published 14 stable builds for this model since Mar 6, 2025: 9 security and 5 feature updates, from Android 15 to Android 17. The current bootloader (binary) version is 10. A device on bit 10 only accepts firmware with bit 10 or higher – see downgrading and the bootloader bit.

Latest build: A266USQUADZJ5
Released: Oct 26, 2026
Android: Android 17
Bootloader bit: 10
Regions: 2
Stable builds: 14

Latest firmware by region (CSC)

Samsung builds firmware per region code (CSC). Pick the code that matches your device – it is shown under Settings › About phone › Software information › Service provider software version. Follow a code for its complete history.

CSC	Region	Latest build	Android	Released	Builds
`CCT`	USA (Comcast)	`A266USQSACZH3`	Android 16	Sep 10, 2026	13
`USC`	USA (US Cellular)	`A266USQUADZJ5`	Android 17	Oct 26, 2026	14

Firmware history (14 builds)

Every stable build (PDA version) Samsung has published for the SM-A266U, newest first. “” is the earliest date the build appeared on Samsung's servers in any region. “” means Samsung no longer serves the file for that build.

Build (PDA)	Released	Android	Type	Bit	Regions	File
`A266USQUADZJ5`	Oct 26, 2026	Android 17	Feature	10	1	on server
`A266USQSACZH3`	Sep 8, 2026	Android 16	Security	10	2	on server
`A266USQS9CZG2`	Jul 30, 2026	Android 16	Security	9	2	on server
`A266USQU8CZEA`	Jun 2, 2026	Android 16	Feature	8	2	on server
`A266USQS8BZD4`	Apr 29, 2026	Android 16	Security	8	2	on server
`A266USQS7BZB6`	Mar 15, 2026	Android 16	Security	7	2	on server
`A266USQS6BZA2`	Feb 10, 2026	Android 16	Security	6	2	on server
`A266USQS5BYK2`	Nov 23, 2025	Android 16	Security	5	2	on server
`A266USQU4BYI2`	Oct 5, 2025	Android 16	Feature	4	2	on server
`A266USQS4AYH1`	Aug 19, 2025	Android 15	Security	4	2	on server
`A266USQS3AYG3`	Jul 24, 2025	Android 15	Security	3	2	on server
`A266USQU2AYD8`	May 11, 2025	Android 15	Feature	2	2	on server
`A266USQS2AYC1`	Apr 13, 2025	Android 15	Security	2	2	on server
`A266USQU1AYB7`	Mar 6, 2025	Android 15	Feature	1	2	on server

How to download SM-A266U firmware

We do not host firmware. Download it directly from Samsung's servers with a free open-source tool, for example samloader:

samloader download -m SM-A266U -r USC

Replace USC with your region code. Step-by-step instructions, including a graphical alternative: How to download Samsung firmware.

Changelog and security patch level

Samsung publishes the release notes for each update, including the security patch level, on its own site. They are listed per region – for example SM-A266U / USC release notes on doc.samsungmobile.com. Each region page here links to the notes for that code.