A166U1UES8DZG1 – Galaxy A16 5G firmware
Build A166U1UES8DZG1 is a security update for the Galaxy A16 5G (SM-A166U1)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Jul 30, 2026 (method) and has reached
13 regions so far. It raises the bootloader bit from 7 to 8: once installed, the device no longer accepts firmware with bit 7 or lower, so a downgrade to A166U1UEU7DZEB is blocked. Samsung still serves this file.
- Model
- SM-A166U1
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 8
- First released
- Jul 30, 2026
- Regions
- 13
Rollout timeline by region
The date each region code (CSC) first received A166U1UES8DZG1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
ACG | USA (C Spire) | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
AIO | USA (Cricket) | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
ATT | USA (AT&T) | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
CCT | USA (Comcast) | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
DSA | USA | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
DSH | USA | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
LRA | USA (Bluegrass) | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
TMB | USA (T-Mobile) | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
TMK | USA (MetroPCS) | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
USC | USA (US Cellular) | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
VZW | USA (Verizon) | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
XAA | USA (unlocked) | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
XAR | USA (Cellular South) | Jul 30, 2026 | day 0 | A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1 |
Download and release notes
samloader download -m SM-A166U1 -r XAA -v A166U1UES8DZG1/A166U1OYM8DZG1/A166U1UES8DZG1Samsung's release notes and security patch level for this update: SM-A166U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode A166U1UES8DZG1.