In Delhi, India, Priya relies on her Digma Citi 8531 3G tablet for online classes and research. After an interrupted OTA update, her MT8321 device entered a boot loop, experienced “SystemUI has stopped” crashes, and lost mobile data. This guide captures community-driven solutions and the official MT8321 V7.0 firmware that fully restored her tablet.
Problem Discovery: Symptoms & Community Clues
🚨 Critical Symptoms
- Boot loop: Displays Digma logo for 6 seconds, then reboots
- Mobile data missing: “No service” despite inserted SIM
- SystemUI crashes: “Unfortunately, SystemUI has stopped” when opening settings
- Forum reports on “TechTalkIndia” cite corrupted
system.imgandnvram.img
Issues Fixed by V7.0 Firmware
Real-World Problems Resolved (from XDA & Indian forums)
- Boot Loop Fix: Restores correct
system.imgstructure after fragmented OTA writes - Mobile Data Recovery: Rebuilds
nvram.imgto restore IMEI and network calibration - SystemUI Stability: Fixes UI resource mismatches that caused crashes
- Charging Animation: Corrects missing animation during charge
- Keyboard Lag: Resolves Gboard input delays experienced after update
Firmware Package Details
| Filename | Digma_Citi_8531_3G_MT8321_7.0.zip |
|---|---|
| Size | 998 MB |
| Android Version | 7.0 Nougat |
| Key Files | MT8321_Citi8531_scatter.txt, boot.img, system.img, nvram.img |
Device Specifications
| Specification | Details |
|---|---|
| Model | Digma Citi 8531 3G |
| Chipset | MediaTek MT8321 (Quad-core 1.3 GHz Cortex-A7) |
| GPU | Mali-400 MP2 |
| RAM/Storage | 1 GB RAM / 8 GB eMMC |
| Display | 7″ IPS 1024×600 |
| Battery | 3500 mAh Li-Polymer |
Required Tools & Drivers
- SP Flash Tool v5.1912
- MediaTek USB VCOM Drivers v1.0.25
- Windows 10 PC, USB 2.0 cable
- Disable antivirus, use direct USB port
For detailed instructions on flashing MediaTek devices, see: How to Flash Stock Firmware to MediaTek MTK Smartphones.
Step-by-Step Flashing Procedure
- Backup NVRAM:
- Open SP Flash Tool → Readback → add
nvram→ click → save backup.
- Open SP Flash Tool → Readback → add
- Load Scatter File:
- Select
MT8321_Citi8531_scatter.txtvia Scatter-loading.
- Select
- Configure Download Mode:
- Uncheck
preloader→ choose Download Only → save profile “Citi8531-7.0”.
- Uncheck
- Connect Device Safely:
- Power off tablet → hold Volume Up + Power → connect USB → wait for COMx detection.
- Execute Flash:
- Click Download → monitor progress → complete when “Download OK”.
- Verify & First Boot:
- Disconnect → power on → allow 4 minutes → confirm mobile data, SystemUI stability, and keyboard responsiveness.
Recovery Results
✅ Success Metrics
- Boot Loop Eliminated: Boots in 30 seconds
- Mobile Data Restored: SIM and 3G connectivity functional
- SystemUI Stability: No crashes over 24-hour testing
- Charging Animation: Displays correctly while charging
- Keyboard Lag Resolved: Instant input response with Gboard
Share Your Recovery Story
Did this guide restore your Digma Citi 8531 3G? Share your logs, unique fixes, and insights below to support our global firmware recovery community!
