A366U1UES9CZG2 – Galaxy A36 5G firmware

Build A366U1UES9CZG2 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 Aug 4, 2026 (method) and has reached 13 regions so far. It raises the bootloader bit from 8 to 9: once installed, the device no longer accepts firmware with bit 8 or lower, so a downgrade to A366U1UES8CZF1 is blocked. Samsung still serves this file.

Model
SM-A366U1
Android
Android 16
Type
Security
Bootloader bit
9
First released
Aug 4, 2026
Regions
13

Rollout timeline by region

The date each region code (CSC) first received A366U1UES9CZG2, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Aug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2
AIOUSA (Cricket)Aug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2
ATTUSA (AT&T)Aug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2
CCTUSA (Comcast)Aug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2
DSAUSAAug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2
DSHUSAAug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2
LRAUSA (Bluegrass)Aug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2
TMBUSA (T-Mobile)Aug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2
TMKUSA (MetroPCS)Aug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2
USCUSA (US Cellular)Aug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2
VZWUSA (Verizon)Aug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2
XAAUSA (unlocked)Aug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2
XARUSA (Cellular South)Aug 4, 2026day 0A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2

Download and release notes

samloader download -m SM-A366U1 -r XAA -v A366U1UES9CZG2/A366U1OYM9CZG2/A366U1UES9CZG2

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 A366U1UES9CZG2.