M366KKSS4BZA1 – Galaxy Jump4 firmware
Build M366KKSS4BZA1 is a security update for the Galaxy Jump4 (SM-M366K)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Feb 2, 2026 (method) and has reached
1 region so far. It raises the bootloader bit from 3 to 4: once installed, the device no longer accepts firmware with bit 3 or lower, so a downgrade to M366KKSS3BYK3 is blocked. Samsung still serves this file.
- Model
- SM-M366K
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 4
- First released
- Feb 2, 2026
- Regions
- 1
Rollout timeline by region
The date each region code (CSC) first received M366KKSS4BZA1, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
KTC | South Korea (KT) | Feb 2, 2026 | day 0 | M366KKSS4BZA1/M366KKTC4BZA1/M366KKSS4BZA1 |
Download and release notes
samloader download -m SM-M366K -r KTC -v M366KKSS4BZA1/M366KKTC4BZA1/M366KKSS4BZA1Samsung's release notes and security patch level for this update: SM-M366K / KTC on doc.samsungmobile.com. What each part of the build number means: decode M366KKSS4BZA1.