A266MUBS9BZD2 – Galaxy A26 5G firmware
Build A266MUBS9BZD2 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 Apr 12, 2026 (method) and has reached
36 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 A266MUBS8BZB6 is blocked. Samsung still serves this file.
- Model
- SM-A266M
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 9
- First released
- Apr 12, 2026
- Regions
- 36
Rollout timeline by region
The date each region code (CSC) first received A266MUBS9BZD2, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
GTO | Guatemala | Apr 12, 2026 | day 0 | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
BVO | Bolivia | Apr 16, 2026 | +4 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
CDR | Dominican Republic | Apr 16, 2026 | +4 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
CGU | Guatemala (Claro) | Apr 16, 2026 | +4 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
COM | Colombia (Claro) | Apr 16, 2026 | +4 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
MXO | Mexico | Apr 16, 2026 | +4 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
PGU | Guatemala | Apr 16, 2026 | +4 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
TCE | Mexico (Telcel) | Apr 16, 2026 | +4 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
TPA | Panama | Apr 16, 2026 | +4 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
ARO | Argentina | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
CHE | Chile (Entel) | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
CHL | Chile (Claro) | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
CHO | Chile | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
CHT | Chile (Movistar) | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
COB | Colombia (Movistar) | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
COL | Colombia | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
COO | Colombia | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
CRC | Costa Rica | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
CTI | Argentina (Claro) | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
DOR | Dominican Republic | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
EBE | Ecuador | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
ECO | Ecuador | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
GLO | Nigeria (Glo) | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
PSN | Argentina (Personal) | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
TGP | Paraguay | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
UFN | Argentina (Movistar) | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
UPO | Uruguay | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
UYO | Uruguay | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
ZTA | Brazil (Claro) | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
ZTM | Brazil (TIM) | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
ZTO | Brazil | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
ZVV | Brazil (Vivo) | Apr 22, 2026 | +10 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
PEO | Peru | Apr 23, 2026 | +11 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
PET | Peru (Movistar) | Apr 23, 2026 | +11 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
PNT | Panama | Apr 23, 2026 | +11 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
SAM | Oceania | Apr 23, 2026 | +11 days | A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2 |
Download and release notes
samloader download -m SM-A266M -r GTO -v A266MUBS9BZD2/A266MOWO9BZD2/A266MUBS9BZD2Samsung'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 A266MUBS9BZD2.