M166SKSS5BZAA – Galaxy Wide8 firmware
Build M166SKSS5BZAA is a security update for the Galaxy Wide8 (SM-M166S)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Jan 29, 2026 (method) and has reached
1 region so far. It raises the bootloader bit from 4 to 5: once installed, the device no longer accepts firmware with bit 4 or lower, so a downgrade to M166SKSS4BYL1 is blocked. Samsung still serves this file.
- Model
- SM-M166S
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 5
- First released
- Jan 29, 2026
- Regions
- 1
Rollout timeline by region
The date each region code (CSC) first received M166SKSS5BZAA, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
SKC | South Korea (SKT) | Jan 29, 2026 | day 0 | M166SKSS5BZAA/M166SSKC5BZAA/M166SKSS5BZAA |
Download and release notes
samloader download -m SM-M166S -r SKC -v M166SKSS5BZAA/M166SSKC5BZAA/M166SKSS5BZAASamsung's release notes and security patch level for this update: SM-M166S / SKC on doc.samsungmobile.com. What each part of the build number means: decode M166SKSS5BZAA.