A566U1UES7CZE5 – Galaxy A56 5G firmware
Build A566U1UES7CZE5 is a security update for the Galaxy A56 5G (SM-A566U1)
on Android 16 (One UI 8). It first appeared on Samsung's servers on May 28, 2026 (method) and has reached
11 regions so far. It keeps bootloader bit 7, so downgrading to the previous build A566U1UEU7CZE2 is still possible. Samsung still serves this file.
- Model
- SM-A566U1
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 7
- First released
- May 28, 2026
- Regions
- 11
Rollout timeline by region
The date each region code (CSC) first received A566U1UES7CZE5, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
ACG | USA (C Spire) | May 28, 2026 | day 0 | A566U1UES7CZE5/A566U1OYM7CZE5/A566U1UES7CZE5 |
AIO | USA (Cricket) | May 28, 2026 | day 0 | A566U1UES7CZE5/A566U1OYM7CZE5/A566U1UES7CZE5 |
ATT | USA (AT&T) | May 28, 2026 | day 0 | A566U1UES7CZE5/A566U1OYM7CZE5/A566U1UES7CZE5 |
CCT | USA (Comcast) | May 28, 2026 | day 0 | A566U1UES7CZE5/A566U1OYM7CZE5/A566U1UES7CZE5 |
LRA | USA (Bluegrass) | May 28, 2026 | day 0 | A566U1UES7CZE5/A566U1OYM7CZE5/A566U1UES7CZE5 |
TMB | USA (T-Mobile) | May 28, 2026 | day 0 | A566U1UES7CZE5/A566U1OYM7CZE5/A566U1UES7CZE5 |
TMK | USA (MetroPCS) | May 28, 2026 | day 0 | A566U1UES7CZE5/A566U1OYM7CZE5/A566U1UES7CZE5 |
USC | USA (US Cellular) | May 28, 2026 | day 0 | A566U1UES7CZE5/A566U1OYM7CZE5/A566U1UES7CZE5 |
VZW | USA (Verizon) | May 28, 2026 | day 0 | A566U1UES7CZE5/A566U1OYM7CZE5/A566U1UES7CZE5 |
XAA | USA (unlocked) | May 28, 2026 | day 0 | A566U1UES7CZE5/A566U1OYM7CZE5/A566U1UES7CZE5 |
XAR | USA (Cellular South) | May 28, 2026 | day 0 | A566U1UES7CZE5/A566U1OYM7CZE5/A566U1UES7CZE5 |
Download and release notes
samloader download -m SM-A566U1 -r XAA -v A566U1UES7CZE5/A566U1OYM7CZE5/A566U1UES7CZE5Samsung's release notes and security patch level for this update: SM-A566U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode A566U1UES7CZE5.