A266U1UES7BZB6 – Galaxy A26 5G firmware

Build A266U1UES7BZB6 is a security update for the Galaxy A26 5G (SM-A266U1) on Android 16 (One UI 8). It first appeared on Samsung's servers on Mar 17, 2026 (method) and has reached 13 regions so far. It raises the bootloader bit from 6 to 7: once installed, the device no longer accepts firmware with bit 6 or lower, so a downgrade to A266U1UES6BZA3 is blocked. Samsung still serves this file.

Model
SM-A266U1
Android
Android 16
Type
Security
Bootloader bit
7
First released
Mar 17, 2026
Regions
13

Rollout timeline by region

The date each region code (CSC) first received A266U1UES7BZB6, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Mar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6
AIOUSA (Cricket)Mar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6
ATTUSA (AT&T)Mar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6
CCTUSA (Comcast)Mar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6
DSAUSAMar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6
DSHUSAMar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6
LRAUSA (Bluegrass)Mar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6
TMBUSA (T-Mobile)Mar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6
TMKUSA (MetroPCS)Mar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6
USCUSA (US Cellular)Mar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6
VZWUSA (Verizon)Mar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6
XAAUSA (unlocked)Mar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6
XARUSA (Cellular South)Mar 17, 2026day 0A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6

Download and release notes

samloader download -m SM-A266U1 -r XAA -v A266U1UES7BZB6/A266U1OYM7BZB6/A266U1UES7BZB6

Samsung's release notes and security patch level for this update: SM-A266U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode A266U1UES7BZB6.