A266MUBUCDZJ5 – Galaxy A26 5G firmware
Build A266MUBUCDZJ5 is a feature update for the Galaxy A26 5G (SM-A266M)
on Android 17 (One UI 9). It first appeared on Samsung's servers on Nov 4, 2026 (method) and has reached
1 region so far. It keeps bootloader bit 12, so downgrading to the previous build A266MUBSCCZJ1 is still possible. Samsung still serves this file.
- Model
- SM-A266M
- Android
- Android 17
- Type
- Feature
- Bootloader bit
- 12
- First released
- Nov 4, 2026
- Regions
- 1
Not yet released in 35 regions that are still on an older build: ARO, BVO, CDR, CGU, CHE, CHL, CHO, CHT, COB, COL, COM, COO, CRC, CTI and 21 more.
Rollout timeline by region
The date each region code (CSC) first received A266MUBUCDZJ5, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
GTO | Guatemala | Nov 4, 2026 | day 0 | A266MUBUCDZJ5/A266MOWOCDZJ5/A266MUBUCDZJ5 |
Download and release notes
samloader download -m SM-A266M -r GTO -v A266MUBUCDZJ5/A266MOWOCDZJ5/A266MUBUCDZJ5Samsung'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 A266MUBUCDZJ5.