A055MUBSKDZI3 – Galaxy A05 firmware

Build A055MUBSKDZI3 is a security update for the Galaxy A05 (SM-A055M) on Android 15 (One UI 7). It first appeared on Samsung's servers on Oct 13, 2026 (method) and has reached 39 regions so far. It raises the bootloader bit from 19 to 20: once installed, the device no longer accepts firmware with bit 19 or lower, so a downgrade to A055MUBSJDZF1 is blocked. Samsung still serves this file.

Model
SM-A055M
Android
Android 15
Type
Security
Bootloader bit
20
First released
Oct 13, 2026
Regions
39

Rollout timeline by region

The date each region code (CSC) first received A055MUBSKDZI3, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
AROArgentinaOct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
BVOBoliviaOct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
CDRDominican RepublicOct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
CGUGuatemala (Claro)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
COBColombia (Movistar)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
COLColombiaOct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
COMColombia (Claro)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
COOColombiaOct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
CRCCosta RicaOct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
CTIArgentina (Claro)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
DORDominican RepublicOct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
EBEEcuadorOct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
ECOEcuadorOct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
GLONigeria (Glo)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
GTOGuatemalaOct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
IUSMexico (AT&T)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
MXOMexicoOct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
PEOPeruOct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
PETPeru (Movistar)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
PGUGuatemalaOct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
PNTPanamaOct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
PSNArgentina (Personal)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
SAMOceaniaOct 13, 2026day 0A055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
TCEMexico (Telcel)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
TGPParaguayOct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
TMMMyanmarOct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
TPAPanamaOct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
UFNArgentina (Movistar)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
UPOUruguayOct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
UYOUruguayOct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
ZTABrazil (Claro)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
ZTMBrazil (TIM)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
ZTOBrazilOct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
ZVVBrazil (Vivo)Oct 13, 2026day 0A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3
CHEChile (Entel)Oct 28, 2026+15 daysA055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
CHLChile (Claro)Oct 28, 2026+15 daysA055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
CHOChileOct 28, 2026+15 daysA055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
CHTChile (Movistar)Oct 28, 2026+15 daysA055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3
CHXChileOct 28, 2026+15 daysA055MUBSKDZI3/A055MOWBKDZI3/A055MUBSKDZI3

Download and release notes

samloader download -m SM-A055M -r ARO -v A055MUBSKDZI3/A055MOWOKDZI3/A055MUBSKDZI3

Samsung's release notes and security patch level for this update: SM-A055M / ARO on doc.samsungmobile.com. What each part of the build number means: decode A055MUBSKDZI3.