A266MUBSCCZJ1 – Galaxy A26 5G firmware
Build A266MUBSCCZJ1 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 Oct 19, 2026 (method) and has reached
17 regions so far. It raises the bootloader bit from 11 to 12: once installed, the device no longer accepts firmware with bit 11 or lower, so a downgrade to A266MUBSBCZH1 is blocked. Samsung still serves this file.
- Model
- SM-A266M
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 12
- First released
- Oct 19, 2026
- Regions
- 17
Rollout timeline by region
The date each region code (CSC) first received A266MUBSCCZJ1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
GTO | Guatemala | Oct 19, 2026 | day 0 | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
CDR | Dominican Republic | Oct 20, 2026 | +1 day | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
COM | Colombia (Claro) | Oct 20, 2026 | +1 day | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
PGU | Guatemala | Oct 20, 2026 | +1 day | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
TCE | Mexico (Telcel) | Oct 20, 2026 | +1 day | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
ZTA | Brazil (Claro) | Oct 20, 2026 | +1 day | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
ZTM | Brazil (TIM) | Oct 20, 2026 | +1 day | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
ZTO | Brazil | Oct 20, 2026 | +1 day | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
ZVV | Brazil (Vivo) | Oct 20, 2026 | +1 day | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
PEO | Peru | Oct 22, 2026 | +3 days | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
PET | Peru (Movistar) | Oct 22, 2026 | +3 days | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
PNT | Panama | Oct 22, 2026 | +3 days | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
SAM | Oceania | Oct 22, 2026 | +3 days | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
BVO | Bolivia | Oct 27, 2026 | +8 days | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
CGU | Guatemala (Claro) | Oct 27, 2026 | +8 days | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
MXO | Mexico | Oct 27, 2026 | +8 days | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
TPA | Panama | Oct 27, 2026 | +8 days | A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1 |
Download and release notes
samloader download -m SM-A266M -r GTO -v A266MUBSCCZJ1/A266MOWOCCZJ1/A266MUBSCCZJ1Samsung'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 A266MUBSCCZJ1.