A366U1UES8CZE3 – Galaxy A36 5G firmware

Build A366U1UES8CZE3 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 Jun 8, 2026 (method) and has reached 13 regions so far. It raises the bootloader bit from 7 to 8: once installed, the device no longer accepts firmware with bit 7 or lower, so a downgrade to A366U1UEU7CZE2 is blocked. Samsung still serves this file.

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

Rollout timeline by region

The date each region code (CSC) first received A366U1UES8CZE3, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Jun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3
AIOUSA (Cricket)Jun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3
ATTUSA (AT&T)Jun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3
CCTUSA (Comcast)Jun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3
DSAUSAJun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3
DSHUSAJun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3
LRAUSA (Bluegrass)Jun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3
TMBUSA (T-Mobile)Jun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3
TMKUSA (MetroPCS)Jun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3
USCUSA (US Cellular)Jun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3
VZWUSA (Verizon)Jun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3
XAAUSA (unlocked)Jun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3
XARUSA (Cellular South)Jun 8, 2026day 0A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3

Download and release notes

samloader download -m SM-A366U1 -r XAA -v A366U1UES8CZE3/A366U1OYM8CZE3/A366U1UES8CZE3

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 A366U1UES8CZE3.