A366USQS8CZE3 – Galaxy A36 5G firmware
Build A366USQS8CZE3 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 2, 2026 (method) and has reached
9 regions 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 A366USQU7CZE1 is blocked. Samsung still serves this file.
- Model
- SM-A366U
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 8
- First released
- Jun 2, 2026
- Regions
- 9
Rollout timeline by region
The date each region code (CSC) first received A366USQS8CZE3, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
AIO | USA (Cricket) | Jun 2, 2026 | day 0 | A366USQS8CZE3/A366UOYN8CZE3/A366USQS8CZE3 |
ATT | USA (AT&T) | Jun 2, 2026 | day 0 | A366USQS8CZE3/A366UOYN8CZE3/A366USQS8CZE3 |
TMB | USA (T-Mobile) | Jun 7, 2026 | +5 days | A366USQS8CZE3/A366UOYN8CZE3/A366USQS8CZE3 |
TMK | USA (MetroPCS) | Jun 7, 2026 | +5 days | A366USQS8CZE3/A366UOYN8CZE3/A366USQS8CZE3 |
DSA | USA | Jun 8, 2026 | +6 days | A366USQS8CZE3/A366UOYN8CZE3/A366USQS8CZE3 |
DSH | USA | Jun 8, 2026 | +6 days | A366USQS8CZE3/A366UOYN8CZE3/A366USQS8CZE3 |
CCT | USA (Comcast) | Jun 8, 2026 | +6 days | A366USQS8CZE3/A366UOYN8CZE3/A366USQS8CZE3 |
VZW | USA (Verizon) | Jun 8, 2026 | +6 days | A366USQS8CZE3/A366UOYN8CZE3/A366USQS8CZE3 |
USC | USA (US Cellular) | Jun 11, 2026 | +9 days | A366USQS8CZE3/A366UOYN8CZE3/A366USQS8CZE3 |
Download and release notes
samloader download -m SM-A366U -r AIO -v A366USQS8CZE3/A366UOYN8CZE3/A366USQS8CZE3Samsung'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 A366USQS8CZE3.