S9420ZHU4BZI6 – Galaxy S26 firmware
Build S9420ZHU4BZI6 is a feature update for the Galaxy S26 (SM-S9420)
on Android 17 (One UI 9). It first appeared on Samsung's servers on Sep 29, 2026 (method) and has reached
2 regions so far. It keeps bootloader bit 4, so downgrading to the previous build S9420ZCS4AZI1 is still possible. Samsung still serves this file.
- Model
- SM-S9420
- Android
- Android 17
- Type
- Feature
- Bootloader bit
- 4
- First released
- Sep 29, 2026
- Regions
- 2
Rollout timeline by region
The date each region code (CSC) first received S9420ZHU4BZI6, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
BRI | Taiwan | Sep 29, 2026 | day 0 | S9420ZHU4BZI6/S9420OZS4BZI6/S9420ZCU4BZI9 |
TGY | Hong Kong | Sep 29, 2026 | day 0 | S9420ZHU4BZI6/S9420OZS4BZI6/S9420ZCU4BZI9 |
Download and release notes
samloader download -m SM-S9420 -r BRI -v S9420ZHU4BZI6/S9420OZS4BZI6/S9420ZCU4BZI9Samsung's release notes and security patch level for this update: SM-S9420 / BRI on doc.samsungmobile.com. What each part of the build number means: decode S9420ZHU4BZI6.