S921NKSSFDZF3 – Galaxy S24 firmware
Build S921NKSSFDZF3 is a security update for the Galaxy S24 (SM-S921N)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Jun 18, 2026 (method) and has reached
4 regions so far. It keeps bootloader bit 15, so downgrading to the previous build S921NKSSFDZE1 is still possible. Samsung still serves this file.
- Model
- SM-S921N
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 15
- First released
- Jun 18, 2026
- Regions
- 4
Rollout timeline by region
The date each region code (CSC) first received S921NKSSFDZF3, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
KOO | South Korea | Jun 18, 2026 | day 0 | S921NKSSFDZF3/S921NOKRFDZF3/S921NKSSFDZE1 |
KTC | South Korea (KT) | Jun 18, 2026 | day 0 | S921NKSSFDZF3/S921NOKRFDZF3/S921NKSSFDZE1 |
LUC | South Korea (LG U+) | Jun 18, 2026 | day 0 | S921NKSSFDZF3/S921NOKRFDZF3/S921NKSSFDZE1 |
SKC | South Korea (SKT) | Jun 18, 2026 | day 0 | S921NKSSFDZF3/S921NOKRFDZF3/S921NKSSFDZE1 |
Download and release notes
samloader download -m SM-S921N -r KOO -v S921NKSSFDZF3/S921NOKRFDZF3/S921NKSSFDZE1Samsung's release notes and security patch level for this update: SM-S921N / KOO on doc.samsungmobile.com. What each part of the build number means: decode S921NKSSFDZF3.