A055MUBULDZJ1 – Galaxy A05 firmware
Build A055MUBULDZJ1 is a feature update for the Galaxy A05 (SM-A055M)
on Android 15 (One UI 7). It first appeared on Samsung's servers on Nov 9, 2026 (method) and has reached
6 regions so far. It raises the bootloader bit from 20 to 21: once installed, the device no longer accepts firmware with bit 20 or lower, so a downgrade to A055MUBSKDZI3 is blocked. Samsung still serves this file.
- Model
- SM-A055M
- Android
- Android 15
- Type
- Feature
- Bootloader bit
- 21
- First released
- Nov 9, 2026
- Regions
- 6
Not yet released in 32 regions that are still on an older build: ARO, CHE, CHL, CHO, CHT, CHX, COB, COL, COO, CRC, CTI, DOR, EBE, ECO and 18 more.
Rollout timeline by region
The date each region code (CSC) first received A055MUBULDZJ1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
BVO | Bolivia | Nov 9, 2026 | day 0 | A055MUBULDZJ1/A055MOWOLDZJ1/A055MUBULDZJ1 |
CDR | Dominican Republic | Nov 9, 2026 | day 0 | A055MUBULDZJ1/A055MOWBLDZJ1/A055MUBULDZJ1 |
CGU | Guatemala (Claro) | Nov 9, 2026 | day 0 | A055MUBULDZJ1/A055MOWBLDZJ1/A055MUBULDZJ1 |
GTO | Guatemala | Nov 9, 2026 | day 0 | A055MUBULDZJ1/A055MOWBLDZJ1/A055MUBULDZJ1 |
PGU | Guatemala | Nov 9, 2026 | day 0 | A055MUBULDZJ1/A055MOWBLDZJ1/A055MUBULDZJ1 |
TPA | Panama | Nov 9, 2026 | day 0 | A055MUBULDZJ1/A055MOWOLDZJ1/A055MUBULDZJ1 |
Download and release notes
samloader download -m SM-A055M -r BVO -v A055MUBULDZJ1/A055MOWOLDZJ1/A055MUBULDZJ1Samsung's release notes and security patch level for this update: SM-A055M / BVO on doc.samsungmobile.com. What each part of the build number means: decode A055MUBULDZJ1.