A366USQSACZI4 – Galaxy A36 5G firmware
Build A366USQSACZI4 is a security update for the Galaxy A36 5G (SM-A366U)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 20, 2026 (method) and has reached
2 regions so far. It keeps bootloader bit 10, so downgrading to the previous build A366USQSACZH1 is still possible. Samsung still serves this file.
- Model
- SM-A366U
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 10
- First released
- Sep 20, 2026
- Regions
- 2
Rollout timeline by region
The date each region code (CSC) first received A366USQSACZI4, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
TMB | USA (T-Mobile) | Sep 20, 2026 | day 0 | A366USQSACZI4/A366UOYNACZI4/A366USQSACZI4 |
TMK | USA (MetroPCS) | Sep 20, 2026 | day 0 | A366USQSACZI4/A366UOYNACZI4/A366USQSACZI4 |
Download and release notes
samloader download -m SM-A366U -r TMB -v A366USQSACZI4/A366UOYNACZI4/A366USQSACZI4Samsung's release notes and security patch level for this update: SM-A366U / TMB on doc.samsungmobile.com. What each part of the build number means: decode A366USQSACZI4.