M366BXXS5BZB3 – Galaxy M36 5G firmware
Build M366BXXS5BZB3 is a security update for the Galaxy M36 5G (SM-M366B)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Mar 17, 2026 (method) and has reached
2 regions so far. It raises the bootloader bit from 4 to 5: once installed, the device no longer accepts firmware with bit 4 or lower, so a downgrade to M366BXXS4BZA3 is blocked. Samsung still serves this file.
- Model
- SM-M366B
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 5
- First released
- Mar 17, 2026
- Regions
- 2
Rollout timeline by region
The date each region code (CSC) first received M366BXXS5BZB3, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
INS | India | Mar 17, 2026 | day 0 | M366BXXS5BZB3/M366BODM5BZB3/M366BXXS5BZB1 |
NPB | Nepal | Mar 17, 2026 | day 0 | M366BXXS5BZB3/M366BODM5BZB3/M366BXXS5BZB1 |
Download and release notes
samloader download -m SM-M366B -r INS -v M366BXXS5BZB3/M366BODM5BZB3/M366BXXS5BZB1Samsung's release notes and security patch level for this update: SM-M366B / INS on doc.samsungmobile.com. What each part of the build number means: decode M366BXXS5BZB3.