A166MUBS9DZGA – Galaxy A16 5G firmware
Build A166MUBS9DZGA is a security update for the Galaxy A16 5G (SM-A166M)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Jul 27, 2026 (method) and has reached
34 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 A166MUBU8DZE9 is blocked. Samsung still serves this file.
- Model
- SM-A166M
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 9
- First released
- Jul 27, 2026
- Regions
- 34
Rollout timeline by region
The date each region code (CSC) first received A166MUBS9DZGA, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
ARO | Argentina | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
CDR | Dominican Republic | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
CGU | Guatemala (Claro) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
CHE | Chile (Entel) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
CHL | Chile (Claro) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
CHO | Chile | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
CHT | Chile (Movistar) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
CHX | Chile | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
COB | Colombia (Movistar) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
COL | Colombia | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
COM | Colombia (Claro) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
COO | Colombia | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
CRC | Costa Rica | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
CTI | Argentina (Claro) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
DOR | Dominican Republic | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
GLO | Nigeria (Glo) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
GTO | Guatemala | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
IUS | Mexico (AT&T) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
MXO | Mexico | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
PEO | Peru | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
PET | Peru (Movistar) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
PGU | Guatemala | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
PNT | Panama | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
PSN | Argentina (Personal) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
SAM | Oceania | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
TCE | Mexico (Telcel) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
TMM | Myanmar | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
TPA | Panama | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
UFN | Argentina (Movistar) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
UYO | Uruguay | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
ZTA | Brazil (Claro) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
ZTM | Brazil (TIM) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
ZTO | Brazil | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
ZVV | Brazil (Vivo) | Jul 27, 2026 | day 0 | A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGA |
Download and release notes
samloader download -m SM-A166M -r ARO -v A166MUBS9DZGA/A166MOWO9DZGA/A166MUBS9DZGASamsung's release notes and security patch level for this update: SM-A166M / ARO on doc.samsungmobile.com. What each part of the build number means: decode A166MUBS9DZGA.