Firmware List:
| # | Model | Version | Region | OS | Size | |
|---|---|---|---|---|---|---|
| 1 | SM-J400M | J400MUBSECVE2 | COB | Q(Android 10) | 2.49 GB | Download |
| 2 | SM-J400M | J400MUBSDCUK3 | COB | Q(Android 10) | 2.49 GB | Download |
| 3 | SM-J400M | J400MUBUCCUG1 | COB | Q(Android 10) | 2.49 GB | Download |
| 4 | SM-J400M | J400MUBSCCUE3 | COB | Q(Android 10) | 2.48 GB | Download |
| 5 | SM-J400M | J400MUBSBCUC1 | COB | Q(Android 10) | 2.48 GB | Download |
| 6 | SM-J400M | J400MUBS8BTE2 | COB | Pie(Android 9) | 2.34 GB | Download |
| 7 | SM-J400M | J400MUBU4BSG3 | COB | Pie(Android 9) | 2.34 GB | Download |
| 8 | SM-J400M | J400MUBS4BSG1 | COB | Pie(Android 9) | 2.34 GB | Download |
| 9 | SM-J400M | J400MUBS7BTB3 | COB | Pie(Android 9) | 2.34 GB | Download |
| 10 | SM-J400M | J400MUBS4BSI2 | COB | Pie(Android 9) | 2.34 GB | Download |
| 11 | SM-J400M | J400MUBU5BSL2 | COB | Pie(Android 9) | 2.34 GB | Download |
| 12 | SM-J400M | J400MUBU3BSDD | COB | Pie(Android 9) | 2.34 GB | Download |
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