A366U1UES8CZF1 – Galaxy A36 5G firmware

Build A366U1UES8CZF1 is a security update for the Galaxy A36 5G (SM-A366U1) on Android 16 (One UI 8). It first appeared on Samsung's servers on Jul 1, 2026 (method) and has reached 13 regions so far. It keeps bootloader bit 8, so downgrading to the previous build A366U1UES8CZE3 is still possible. Samsung still serves this file.

Model
SM-A366U1
Android
Android 16
Type
Security
Bootloader bit
8
First released
Jul 1, 2026
Regions
13

Rollout timeline by region

The date each region code (CSC) first received A366U1UES8CZF1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Jul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1
AIOUSA (Cricket)Jul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1
ATTUSA (AT&T)Jul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1
CCTUSA (Comcast)Jul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1
DSAUSAJul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1
DSHUSAJul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1
LRAUSA (Bluegrass)Jul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1
TMBUSA (T-Mobile)Jul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1
TMKUSA (MetroPCS)Jul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1
USCUSA (US Cellular)Jul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1
VZWUSA (Verizon)Jul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1
XAAUSA (unlocked)Jul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1
XARUSA (Cellular South)Jul 1, 2026day 0A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1

Download and release notes

samloader download -m SM-A366U1 -r XAA -v A366U1UES8CZF1/A366U1OYM8CZF1/A366U1UES8CZF1

Samsung's release notes and security patch level for this update: SM-A366U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode A366U1UES8CZF1.