Galaxy A16 5G SM-A166U1 firmware

The latest stable build is A166U1UEUAEZJ8 (Android 17, feature update), first released on Nov 4, 2026 – 2 days ago. Samsung has published 18 stable builds for this model since Dec 10, 2024: 13 security and 5 feature updates, from Android 14 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: A166U1UEUAEZJ8
Released: Nov 4, 2026
Android: Android 17
Bootloader bit: 10
Regions: 13
Stable builds: 18

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
`ACG`	USA (C Spire)	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18
`AIO`	USA (Cricket)	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18
`ATT`	USA (AT&T)	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18
`CCT`	USA (Comcast)	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18
`DSA`	USA	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18
`DSH`	USA	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18
`LRA`	USA (Bluegrass)	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18
`TMB`	USA (T-Mobile)	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18
`TMK`	USA (MetroPCS)	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18
`USC`	USA (US Cellular)	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18
`VZW`	USA (Verizon)	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18
`XAA`	USA (unlocked)	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18
`XAR`	USA (Cellular South)	`A166U1UEUAEZJ8`	Android 17	Nov 4, 2026	18

Firmware history (18 builds)

Every stable build (PDA version) Samsung has published for the SM-A166U1, 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
`A166U1UEUAEZJ8`	Nov 4, 2026	Android 17	Feature	10	13	on server
`A166U1UESADZI2`	Oct 2, 2026	Android 16	Security	10	13	on server
`A166U1UES9DZH1`	Sep 14, 2026	Android 16	Security	9	13	on server
`A166U1UES8DZG1`	Jul 30, 2026	Android 16	Security	8	13	on server
`A166U1UEU7DZEB`	Jun 4, 2026	Android 16	Feature	7	13	on server
`A166U1UES7CZDG`	May 13, 2026	Android 16	Security	7	13	on server
`A166U1UES6CZB6`	Mar 16, 2026	Android 16	Security	6	13	on server
`A166U1UES5CZA8`	Feb 8, 2026	Android 16	Security	5	13	on server
`A166U1UES4CYL1`	Dec 21, 2025	Android 16	Security	4	13	on server
`A166U1UES3CYJ1`	Nov 6, 2025	Android 16	Security	3	13	on server
`A166U1UEU3CYIC`	Nov 2, 2025	Android 16	Feature	3	13	on server
`A166U1UES3BYF4`	Jul 29, 2025	Android 15	Security	3	13	on server
`A166U1UES2BYF3`	Jun 30, 2025	Android 15	Security	2	13	on server
`A166U1UEU2BYED`	Jun 24, 2025	Android 15	Feature	2	13	on server
`A166U1UES2AYCA`	Apr 16, 2025	Android 14	Security	2	13	on server
`A166U1UES1AYA3`	Jan 22, 2025	Android 14	Security	1	13	on server
`A166U1UES1AXL2`	Dec 17, 2024	Android 14	Security	1	13	on server
`A166U1UEU1AXK8`	Dec 10, 2024	Android 14	Feature	1	13	on server

How to download SM-A166U1 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-A166U1 -r XAA

Replace XAA 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-A166U1 / XAA release notes on doc.samsungmobile.com. Each region page here links to the notes for that code.