A266MUBSBCZH1 – Galaxy A26 5G firmware

Build A266MUBSBCZH1 is a security update for the Galaxy A26 5G (SM-A266M) on Android 16 (One UI 8). It first appeared on Samsung's servers on Aug 26, 2026 (method) and has reached 36 regions so far. It raises the bootloader bit from 10 to 11: once installed, the device no longer accepts firmware with bit 10 or lower, so a downgrade to A266MUBSACZG1 is blocked. Samsung still serves this file.

Model
SM-A266M
Android
Android 16
Type
Security
Bootloader bit
11
First released
Aug 26, 2026
Regions
36

Rollout timeline by region

The date each region code (CSC) first received A266MUBSBCZH1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
GTOGuatemalaAug 26, 2026day 0A266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
BVOBoliviaSep 1, 2026+6 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
MXOMexicoSep 1, 2026+6 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
TPAPanamaSep 1, 2026+6 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
ZTABrazil (Claro)Sep 1, 2026+6 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
ZTMBrazil (TIM)Sep 1, 2026+6 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
ZTOBrazilSep 1, 2026+6 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
ZVVBrazil (Vivo)Sep 1, 2026+6 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
AROArgentinaSep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
CDRDominican RepublicSep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
CGUGuatemala (Claro)Sep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
COBColombia (Movistar)Sep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
COLColombiaSep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
COMColombia (Claro)Sep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
COOColombiaSep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
CTIArgentina (Claro)Sep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
PEOPeruSep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
PETPeru (Movistar)Sep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
PGUGuatemalaSep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
PNTPanamaSep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
PSNArgentina (Personal)Sep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
SAMOceaniaSep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
TCEMexico (Telcel)Sep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
TGPParaguaySep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
UFNArgentina (Movistar)Sep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
UPOUruguaySep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
UYOUruguaySep 9, 2026+14 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
CRCCosta RicaSep 10, 2026+15 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
DORDominican RepublicSep 10, 2026+15 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
GLONigeria (Glo)Sep 10, 2026+15 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
CHEChile (Entel)Sep 17, 2026+22 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
CHLChile (Claro)Sep 17, 2026+22 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
CHOChileSep 17, 2026+22 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
CHTChile (Movistar)Sep 17, 2026+22 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
EBEEcuadorSep 17, 2026+22 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1
ECOEcuadorSep 17, 2026+22 daysA266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1

Download and release notes

samloader download -m SM-A266M -r GTO -v A266MUBSBCZH1/A266MOWOBCZH1/A266MUBSBCZH1

Samsung's release notes and security patch level for this update: SM-A266M / GTO on doc.samsungmobile.com. What each part of the build number means: decode A266MUBSBCZH1.