If your Digma Citi 7 E401 4G (Rev1) is stuck on the logo, facing SIM or cellular issues, or suffering battery, touch, or malware faults, flashing official factory firmware is your most reliable fix. This article delivers the certified ROM, easy SPD tool instructions, and troubleshooting sourced from Russian and global tech forums.
🚨 Critical Pre-Flash Warning
Flashing erases all your data — backup files before proceeding. Only use this firmware with Citi 7 E401 4G Rev1 hardware; incorrect flashing can lock, brick, or degrade network and touch functionality.
Device Specifications Verification
Match these to your tablet for safety:
| Specification | Details |
|---|---|
| Device Name | Digma Citi 7 E401 4G (Rev1) |
| Chipset | Spreadtrum/UNISOC SC9832E (Quad-core, 1.4GHz) |
| Display | 7.0″ IPS, 1024 x 600 px |
| RAM/Storage | 1 GB / 8 GB (expandable by microSD) |
| Battery | 2500 mAh |
| Android Version | Android 10 (some batches Android 9/8.1) |
| Modem | 4G LTE, Dual SIM, WiFi, Bluetooth |
| Camera | 2MP rear / 0.3MP front |
Official Firmware Downloads
| Filename | Date | Build | Android | Size | Download Link |
|---|---|---|---|---|---|
| Digma_Citi_7_E401_4G_Rev1_Factory_201212_SPD.zip | Dec 2020 | 201212 | 10 (or 9.0) | 1.03GB | Download |
⭐ Recommendation: Only use this factory ROM for 4G “Rev1” models—supports all Russian/EU languages, ensures LTE stability, and fixes Bluetooth bugs common in earlier beta builds.
Required Tools & Drivers
- SPD Upgrade Tool (latest version preferred)
- Spreadtrum/UNISOC USB Drivers
- Digma Citi 7 E401 4G firmware (see table)
Driver Install Tips:
- Disable Windows driver signature enforcement if device is not detected after driver installation.
- Connect the tablet to your PC only after successful driver and tool install.
Quick Flash Instructions
- Install the Spreadtrum/UNISOC USB drivers.
- Extract both firmware zip and SPD Upgrade Tool.
- Launch SPD Upgrade Tool and load the firmware’s
.pacfile. - Click “Start”, power off your tablet, plug in by USB, and wait for the green Pass message.
- Disconnect and boot the device.
For deeper troubleshooting and detailed error fixes, consult the “How to Use SPD Upgrade Tool” guide:
Full SPD Upgrade Tool Guide
Troubleshooting & Optimization Guide
1. No 4G/3G SIM or No Network After Flash
- Symptoms: No mobile data, SOS or “Insert SIM” after firmware update.
- Firmware flash typically restores all modem files; use Download Only mode in SPD tool.
- If IMEI is missing, restore it legally using professional tools or at service center.
- Reboot after first config, reseat SIM cards, and select preferred network manually.
2. Bootloop, Freeze, or Logo Stuck
- Symptoms: Device stuck on Digma logo or endless boot animation after flashing.
- Reflash using a different cable or USB port.
- Remove SD/memory card—user reports suggest bad/corrupted cards cause loops.
- After flashing and first boot, factory reset from stock recovery menu (Power + VolUp).
3. Touch Screen Not Responding, Calibration Issues
- Symptoms: No touch, laggy edges, swipe/unlock unreliable.
- Correct firmware restores touch panel drivers (confirmed from Russian forums).
- Avoid thick tempered glass or covers, as hardware users noticed edge loss with cheap protectors.
- If touch stays dead, hardware repair may be required for faulty digitizer.
4. Rapid Battery Drain, Not Charging
- Symptoms: Fast battery drop, inaccurate % or won’t fully charge.
- Run 2–3 discharge/recharge cycles after firmware installation for software calibration.
- If issues persist, try charger and cable swap, clean port.
- Persistent rapid drain is usually a sign of an old battery after 1+ year use.
5. Google Apps Fail to Work or Crash
- Symptoms: Play Store missing, Google apps continually crashing or can’t log in.
- Re-flash the official ROM to fix corrupted system partition.
- Check system date/time is accurate after flashing.
- Update Google Play Services and Play Store as the very first step after WiFi connection.
Advanced Recovery & Customization
This model supports only stock recovery and SPD-based Fastboot flashing. Community-made TWRP is rare and not widely reported stable for “E401 4G,” so do not attempt unless you can backup all device partitions beforehand.
Frequently Asked Questions (Unique – Citi 7 E401 4G)
- Does this firmware work on all Digma Citi 7 models?
- No. It is strictly for “Citi 7 E401 4G Rev1” hardware. Flashing to older WiFi or non-4G versions may brick those devices.
- What Android version does this fully support?
- Official images are Android 10, but some batches ship with 9.0 or 8.1 preloaded. This ROM updates all supported batches.
- How to fix “no baseband” after flashing?
- Usually caused by a corrupted modem file or IMEI wipe—reflash, select network again, and restore IMEI if needed through service.
- Touch not working after successful flash?
- Try removing overlays or repeating with another PC/USB port. If still no response, touch panel (digitizer) may be physically damaged.
- Are Google apps preinstalled in this ROM?
- Yes. If some are missing or crash, re-add your Google account and update all Play Services as soon as WiFi is available.
Conclusion
Flashing your Digma Citi 7 E401 4G (Rev1) with this factory firmware will resolve most network, SIM, malware, and touch-related issues. Always check for exact model match, use the right SPD tool procedure, and share your success or findings with the community for more confident recoveries!
