A166PXXS6CZA1 – Galaxy A16 5G firmware
Build A166PXXS6CZA1 is a security update for the Galaxy A16 5G (SM-A166P)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Jan 19, 2026 (method) and has reached
26 regions so far. It raises the bootloader bit from 5 to 6: once installed, the device no longer accepts firmware with bit 5 or lower, so a downgrade to A166PXXS5CYJ1 is blocked. Samsung still serves this file.
- Model
- SM-A166P
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 6
- First released
- Jan 19, 2026
- Regions
- 26
Rollout timeline by region
The date each region code (CSC) first received A166PXXS6CZA1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
XXV | Vietnam | Jan 19, 2026 | day 0 | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
GLB | Philippines (Globe) | Jan 19, 2026 | day 0 | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
THL | Thailand | Jan 19, 2026 | day 0 | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
XME | Malaysia | Jan 19, 2026 | day 0 | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
XTC | Philippines | Jan 19, 2026 | day 0 | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
OPS | Australia (Optus) | Jan 22, 2026 | +3 days | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
TEL | Australia (Telstra) | Jan 22, 2026 | +3 days | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
VAU | Australia (Vodafone) | Jan 22, 2026 | +3 days | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
XNZ | New Zealand | Jan 22, 2026 | +3 days | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
XSA | Australia | Jan 22, 2026 | +3 days | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
ACR | Ghana | Jan 22, 2026 | +3 days | A166PXXS6CZA1/A166POJM6CZA1/A166PXXS6CZA1 |
XID | Indonesia | Jan 26, 2026 | +7 days | A166PXXS6CZA1/A166POLE6CZA1/A166PXXS6CZA1 |
MM1 | Singapore (M1) | Jan 26, 2026 | +7 days | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
SIN | Singapore (Singtel) | Jan 26, 2026 | +7 days | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
STH | Singapore (StarHub) | Jan 26, 2026 | +7 days | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
XSP | Singapore | Jan 26, 2026 | +7 days | A166PXXS6CZA1/A166POLM6CZA1/A166PXXS6CZA1 |
AFR | Africa | Jan 26, 2026 | +7 days | A166PXXS6CZA1/A166POJM6CZA1/A166PXXS6CZA1 |
DKR | Senegal | Jan 26, 2026 | +7 days | A166PXXS6CZA1/A166POJM6CZA1/A166PXXS6CZA1 |
ECT | Nigeria | Jan 26, 2026 | +7 days | A166PXXS6CZA1/A166POJM6CZA1/A166PXXS6CZA1 |
XFA | South Africa | Jan 26, 2026 | +7 days | A166PXXS6CZA1/A166POJM6CZA1/A166PXXS6CZA1 |
XFV | South Africa (Vodacom) | Jan 26, 2026 | +7 days | A166PXXS6CZA1/A166POJM6CZA1/A166PXXS6CZA1 |
BKD | Bangladesh | Jan 29, 2026 | +10 days | A166PXXS6CZA1/A166PODM6CZA1/A166PXXS6CZA1 |
BNG | Belgium | Jan 29, 2026 | +10 days | A166PXXS6CZA1/A166PODM6CZA1/A166PXXS6CZA1 |
INS | India | Jan 29, 2026 | +10 days | A166PXXS6CZA1/A166PODM6CZA1/A166PXXS6CZA1 |
NPB | Nepal | Jan 29, 2026 | +10 days | A166PXXS6CZA1/A166PODM6CZA1/A166PXXS6CZA1 |
SLK | Sri Lanka | Jan 29, 2026 | +10 days | A166PXXS6CZA1/A166PODM6CZA1/A166PXXS6CZA1 |
Download and release notes
samloader download -m SM-A166P -r INS -v A166PXXS6CZA1/A166PODM6CZA1/A166PXXS6CZA1Samsung's release notes and security patch level for this update: SM-A166P / INS on doc.samsungmobile.com. What each part of the build number means: decode A166PXXS6CZA1.