A166LKSS5BZAA – Galaxy Buddy4 firmware
Build A166LKSS5BZAA is a security update for the Galaxy Buddy4 (SM-A166L)
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 A166LKSS4BYL2 is blocked. Samsung still serves this file.
- Model
- SM-A166L
- 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 A166LKSS5BZAA, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
LUC | South Korea (LG U+) | Jan 29, 2026 | day 0 | A166LKSS5BZAA/A166LLUC5BZAA/A166LKLS5BZAA |
Download and release notes
samloader download -m SM-A166L -r LUC -v A166LKSS5BZAA/A166LLUC5BZAA/A166LKLS5BZAASamsung's release notes and security patch level for this update: SM-A166L / LUC on doc.samsungmobile.com. What each part of the build number means: decode A166LKSS5BZAA.