Firmware List:
| # | Model | Version | Region | OS | Size | |
|---|---|---|---|---|---|---|
| 1 | SM-J400F | J400FXXU9CUJ3 | ECT | Q(Android 10) | 2.5 GB | Download |
| 2 | SM-J400F | J400FXXU8CUF4 | ECT | Q(Android 10) | 2.5 GB | Download |
| 3 | SM-J400F | J400FXXS8CUD3 | ECT | Q(Android 10) | 2.5 GB | Download |
| 4 | SM-J400F | J400FXXU6CTGO | ECT | Q(Android 10) | 2.49 GB | Download |
| 5 | SM-J400F | J400FXXS6BTF8 | ECT | Pie(Android 9) | 2.33 GB | Download |
| 6 | SM-J400F | J400FXXU2ARK2 | ECT | Oreo(Android 8.0.0) | 2.14 GB | Download |
| 7 | SM-J400F | J400FXXU1ARE8 | ECT | Oreo(Android 8.0.0) | 2.06 GB | Download |
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