M166SKSS8CZH9 – Galaxy Wide8 firmware
Build M166SKSS8CZH9 is a security update for the Galaxy Wide8 (SM-M166S)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 3, 2026 (method) and has reached
1 region 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 M166SKSS7CZG1 is blocked. Samsung still serves this file.
- Model
- SM-M166S
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 8
- First released
- Sep 3, 2026
- Regions
- 1
Rollout timeline by region
The date each region code (CSC) first received M166SKSS8CZH9, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
SKC | South Korea (SKT) | Sep 3, 2026 | day 0 | M166SKSS8CZH9/M166SSKC8CZH9/M166SKSS8CZH9 |
Download and release notes
samloader download -m SM-M166S -r SKC -v M166SKSS8CZH9/M166SSKC8CZH9/M166SKSS8CZH9Samsung'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 M166SKSS8CZH9.