F721BXXSCIZH4 – Galaxy Z Flip4 firmware
Build F721BXXSCIZH4 is a security update for the Galaxy Z Flip4 (SM-F721B)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 6, 2026 (method) and has reached
4 regions so far. It keeps bootloader bit 12, so downgrading to the previous build F721BXXSCIZH3 is still possible. Samsung still serves this file.
- Model
- SM-F721B
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 12
- First released
- Sep 6, 2026
- Regions
- 4
Not yet released in 46 regions that are still on an older build: ACR, AFG, AFR, BOG, BTB, DKR, ECT, EGY, EUY, EVR, GLB, ILO, KSA, LYS and 32 more.
Rollout timeline by region
The date each region code (CSC) first received F721BXXSCIZH4, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
OPS | Australia (Optus) | Sep 6, 2026 | day 0 | F721BXXSCIZH4/F721BOXMCIZE2/F721BXXSCIZE2 |
TEL | Australia (Telstra) | Sep 6, 2026 | day 0 | F721BXXSCIZH4/F721BOXMCIZE2/F721BXXSCIZE2 |
VAU | Australia (Vodafone) | Sep 6, 2026 | day 0 | F721BXXSCIZH4/F721BOXMCIZE2/F721BXXSCIZE2 |
XSA | Australia | Sep 6, 2026 | day 0 | F721BXXSCIZH4/F721BOXMCIZE2/F721BXXSCIZE2 |
Download and release notes
samloader download -m SM-F721B -r XSA -v F721BXXSCIZH4/F721BOXMCIZE2/F721BXXSCIZE2Samsung's release notes and security patch level for this update: SM-F721B / XSA on doc.samsungmobile.com. What each part of the build number means: decode F721BXXSCIZH4.