In São Paulo, Brazil, Mariana uses her Digma Plane 7546S 3G (SC7731) for e-learning and video calls. After a failed system update left her tablet in a boot loop and disabled mobile data, she sought help on local forums and XDA. This article documents the precise steps to restore functionality using the official SC7731 V20171023 Android 7.0 firmware.
Problem Overview: Boot Loop & Mobile Data Loss
👤 Profile
Mariana is a Brazilian university student who relies on her tablet for online classes. When her Plane 7546S froze during an OTA update, traditional recovery methods failed. Community-sourced solutions saved her device.
Symptoms & Community Clues
- Boot loop: Digma logo displays briefly then restarts
- No mobile network detected
- Brazilian forum “TechTabletBR” reported corrupted
nvram.imgafter similar failures - XDA thread recommended SPD Tool R27.24 for SC7731 flash compatibility
⚠️ Critical Warning
Flashing nvram.img incorrectly will erase IMEI and network settings. Always back up NVRAM first.
Firmware Package Details
| Filename | Digma_Plane_7546S_3G_SC7731_20171023_7.0_SPD.zip |
|---|---|
| Size | 920 MB |
| Build Date | 2017-10-23 |
| Android Version | 7.0 Nougat |
| Key Files | SC7731_Plane7546S_scatter.txt, preloader.bin, boot.img, system.img, nvram.img |
Device Specifications
| Specification | Details |
|---|---|
| Model | Digma Plane 7546S 3G |
| Chipset | UNISOC SC7731 (Quad-core 1.3 GHz Cortex-A7) |
| RAM/Storage | 1 GB RAM / 8 GB eMMC |
| Display | 7″ IPS 1024×600 |
| Battery | 3000 mAh Li-Ion |
Required Tools & Drivers
- SPD Upgrade Tool R27.24
- Spreadtrum USB Drivers v4.20.0201
- Windows 10 PC, USB 2.0 cable
- Disable antivirus, use direct USB port
See our SPD flashing guide for complete instructions: How to Use the SPD Upgrade Tool to Flash Your Smartphone.
Step-by-Step Flashing Procedure
- Backup NVRAM:
- In SPD Tool → Readback → add
nvram→ click → save backup.
- In SPD Tool → Readback → add
- Load Scatter File:
- Select
SC7731_Plane7546S_scatter.txt.
- Select
- Configure Download Mode:
- Uncheck
preloader.bin→ select Download Only → save profile “Plane7546S-20171023”.
- Uncheck
- Connect Device:
- Power off tablet → hold Volume Down → connect USB → wait for COMx detection.
- Execute Flash:
- Click Download → monitor progress → complete when Download OK.
- First Boot:
- Disconnect → power on → allow 3–4 minutes for setup → verify mobile data under Settings → About Tablet.
Recovery Results
✅ Success Metrics
- Boot Loop Resolved: Device boots in 30 seconds
- Mobile Data Restored: SIM detected, stable connectivity
- System Stability: No crashes over 24 h testing
- User Feedback: Mariana resumed coursework and streaming seamlessly
Share Your Success
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