F731BTCS7GZI1 – Galaxy Z Flip5 firmware
Build F731BTCS7GZI1 is a security update for the Galaxy Z Flip5 (SM-F731B)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 27, 2026 (method) and has reached
2 regions so far. It keeps bootloader bit 7, so downgrading to the previous build F731BXXS7GZI1 is still possible. Samsung still serves this file.
- Model
- SM-F731B
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 7
- First released
- Sep 27, 2026
- Regions
- 2
Rollout timeline by region
The date each region code (CSC) first received F731BTCS7GZI1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
XSA | Australia | Sep 27, 2026 | day 0 | F731BTCS7GZI1/F731BOSW7GZE5/F731BXXS7GZE5 |
EUX | Europe (Multi-CSC) | Sep 29, 2026 | +2 days | F731BTCS7GZI1/F731BOSW7GZE5/F731BXXS7GZE5 |
Download and release notes
samloader download -m SM-F731B -r EUX -v F731BTCS7GZI1/F731BOSW7GZE5/F731BXXS7GZE5Samsung's release notes and security patch level for this update: SM-F731B / EUX on doc.samsungmobile.com. What each part of the build number means: decode F731BTCS7GZI1.