In Mexico City, Alejandro uses his Digma Optima Prime 4 3G tablet for field sales and presentations. After an interrupted system update caused persistent boot loops and disabled cellular data, he sought help on local tech communities and XDA. This narrative details how the official SC7731 V20180607 Android 7.0 firmware recovered his device.
Problem Identified: Endless Boot Loop & No Mobile Data
🚨 Symptoms
- Boot loop: Digma splash appears, then restarts continuously
- SIM and mobile data not detected
- Mexican forum “TabletMX” noted corrupted
nvram.imgfrom failed flashes - XDA thread recommended SPD Tool R27.24 for SC7731-based devices to prevent BROM errors
Firmware Package Details
| Filename | Digma_Optima_Prime_4_3G_TT7174PG_SC7731_20180607_7.0_SPD.zip |
|---|---|
| Size | 920 MB |
| Build Date | 2018-06-07 |
| Android Version | 7.0 Nougat |
| Key Files | TT7174PG_V7.0.pac, preloader, boot.img, system.img, nvram.img |
Device Specifications
| Specification | Details |
|---|---|
| Model | Digma Optima Prime 4 3G (TT7174PG) |
| Chipset | UNISOC SC7731 (Quad-core 1.3 GHz Cortex-A7) |
| RAM/Storage | 2 GB RAM / 16 GB eMMC |
| Display | 8″ IPS 1280×800 |
| Battery | 4500 mAh Li-Polymer |
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
For detailed instructions on using SPD Tool with UNISOC devices, see our guide: 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 → savenvram_backup.bin.
- In SPD Tool → Readback → add
- Load Packet:
- Unzip package → open SPD Tool → Gear icon → select
TT7174PG_V7.0.pac.
- Unzip package → open SPD Tool → Gear icon → select
- Configure Download Mode:
- Uncheck
preloader→ choose Download Only → save profile “OptimaPrime4-7.0”.
- 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 up to 4 minutes → verify mobile data under Settings → About Tablet.
Recovery Results
✅ Success Metrics
- Boot Loop Resolved: Tablet boots in 35 seconds
- Mobile Data Restored: SIM and LTE connectivity functional
- System Stability: No restarts or freezes during 24-hour testing
- User Feedback: Alejandro resumed sales presentations seamlessly
Share Your Victory
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