A366USQS8CZF1 – Galaxy A36 5G firmware
Build A366USQS8CZF1 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 Jun 29, 2026 (method) and has reached
9 regions so far. It keeps bootloader bit 8, so downgrading to the previous build A366USQS8CZE3 is still possible. Samsung still serves this file.
- Model
- SM-A366U
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 8
- First released
- Jun 29, 2026
- Regions
- 9
Rollout timeline by region
The date each region code (CSC) first received A366USQS8CZF1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
AIO | USA (Cricket) | Jun 29, 2026 | day 0 | A366USQS8CZF1/A366UOYN8CZF1/A366USQS8CZF1 |
ATT | USA (AT&T) | Jun 29, 2026 | day 0 | A366USQS8CZF1/A366UOYN8CZF1/A366USQS8CZF1 |
DSA | USA | Jun 29, 2026 | day 0 | A366USQS8CZF1/A366UOYN8CZF1/A366USQS8CZF1 |
DSH | USA | Jun 29, 2026 | day 0 | A366USQS8CZF1/A366UOYN8CZF1/A366USQS8CZF1 |
TMB | USA (T-Mobile) | Jun 29, 2026 | day 0 | A366USQS8CZF1/A366UOYN8CZF1/A366USQS8CZF1 |
TMK | USA (MetroPCS) | Jun 29, 2026 | day 0 | A366USQS8CZF1/A366UOYN8CZF1/A366USQS8CZF1 |
VZW | USA (Verizon) | Jun 30, 2026 | +1 day | A366USQS8CZF1/A366UOYN8CZF1/A366USQS8CZF1 |
USC | USA (US Cellular) | Jul 5, 2026 | +6 days | A366USQS8CZF1/A366UOYN8CZF1/A366USQS8CZF1 |
CCT | USA (Comcast) | Jul 6, 2026 | +7 days | A366USQS8CZF1/A366UOYN8CZF1/A366USQS8CZF1 |
Download and release notes
samloader download -m SM-A366U -r AIO -v A366USQS8CZF1/A366UOYN8CZF1/A366USQS8CZF1Samsung's release notes and security patch level for this update: SM-A366U / AIO on doc.samsungmobile.com. What each part of the build number means: decode A366USQS8CZF1.