If your Cubot X18 Plus is experiencing persistent bootloop crashes, dual camera coordination failures, rapid battery drain issues, or unresponsive fingerprint scanner problems, flashing the official stock firmware provides the most comprehensive solution. This expert guide delivers tested firmware downloads, detailed SP Flash Tool instructions, and proven troubleshooting methods to restore your MT6750T-powered device to optimal performance.
🚨 Critical Pre-Flash Warning
Flashing firmware will permanently erase all data on your Cubot X18 Plus, including photos, apps, contacts, and personal files. Create a complete backup before proceeding. Incorrect use of SP Flash Tool can damage IMEI, bootloader, or cause permanent brick—follow instructions precisely.
Device Specifications Verification
Confirm these specifications match your device before flashing:
| Specification | Details |
|---|---|
| Device Name | Cubot X18 Plus |
| Release Date | January 2018 |
| Chipset | MediaTek MT6750T (28nm, Octa-Core 1.5GHz) |
| GPU | ARM Mali-T860 MP2 @ 650MHz |
| Display | 5.99″ IPS LCD, 2160×1080 FHD+, 18:9 ratio (403 ppi) |
| RAM/Storage | 4GB RAM / 64GB internal storage |
| Battery | 4000mAh non-removable Li-Ion |
| Android Version | Android 8.0 Oreo (stock) |
| Key Features | 20MP + 2MP dual rear camera, 13MP front camera, rear fingerprint |
Official Firmware Downloads
| Filename | Date | Region | Android | Size | Download Link/s |
|---|---|---|---|---|---|
| Cubot_X18_Plus_MT6750_V23_20180424.zip | Apr 2018 | Global | 8.0 | 1.26GB | Download (MediaFire) |
| Cubot_X18_Plus_MT6750_20180524_8.0.zip | May 2018 | Global | 8.0 | 1.24GB | Download (MediaFire) |
| Cubot_X18_Plus_MT6750_20180709_8.0.zip | Jul 2018 | Global | 8.0 | 1.26GB | Download (MediaFire) |
| cubot-x18-plus-8021c-v31-20180717.zip | Jul 2018 | Global | 8.0 | 1.25GB | Download (MEGA) |
| CUBOT_X18_Plus_8021C_V37_20190425.zip | Apr 2019 | Global | 8.0 | 1.30GB | Download (MEGA) |
⭐ Recommendation: Always use V37 (April 2019) firmware as it includes critical security patches, bootloop fixes, improved dual camera algorithms, enhanced battery management, and refined fingerprint sensor calibration.
Required Tools & Drivers
- SP Flash Tool (latest version)
- MediaTek VCOM USB Drivers
- Cubot X18 Plus firmware package (from table above)
Driver Installation Notes:
- On Windows 10/11, you may need to disable driver signature enforcement
- Install drivers before connecting your phone
- Ensure proper USB cable connection (avoid damaged or cheap cables)
Quick Cubot X18 Plus Firmware Flashing Instructions
-
Download and install SP Flash Tool along with MediaTek VCOM drivers on your computer.
-
Extract the firmware file and locate the scatter file (usually
MT6750_Android_scatter.txt). -
Open SP Flash Tool and click “Scatter-Loading” button to load the scatter file from the firmware folder.
-
Set the mode to “Download Only” (never use “Format All” unless absolutely necessary to avoid IMEI loss).
-
Power off your Cubot X18 Plus completely and ensure it has at least 50% battery charge.
-
Click the “Download” button in SP Flash Tool, then connect your powered-off device to PC via USB cable to begin the flashing process.
For comprehensive instructions including error troubleshooting, driver issues, and advanced recovery methods, visit our complete guide: How to Flash Firmware on MediaTek (MTK) Smartphones.
Troubleshooting & Optimization Guide
1. Persistent Bootloop and System Crashes
- Symptoms: Device stuck on logo screen, continuous restart cycles, won’t boot to Android, black screen.
- Use V37 firmware for enhanced bootloop protection and system stability
- In SP Flash Tool, select “Download Only” mode (never “Firmware Upgrade”)
- Ensure proper USB driver installation and cable connection
- If standard flash fails, try “Format All + Download” (WARNING: Will erase IMEI)
- For persistent issues, disconnect/reconnect battery or seek professional repair
2. Dual Camera System Malfunctions
- Symptoms: Portrait mode not working, bokeh effect broken, secondary camera inactive, camera app crashes.
- Clear camera app data: Settings > Apps > Camera > Storage > Clear Data
- Test dual camera in good lighting, subject 2-4 feet away from lens
- Uninstall all third-party camera apps to eliminate conflicts
- Flash V37 firmware for improved dual camera coordination algorithms
- If hardware failure suspected, professional camera module replacement needed
3. Rapid Battery Drain and Charging Issues
- Symptoms: Battery depletes quickly, inconsistent charging, overheating during charge, false battery readings.
- Use original Cubot charger and cable (avoid cheap third-party alternatives)
- Disable Wi-Fi scanning and Bluetooth scanning in advanced settings
- Clear system cache and limit background apps to essential ones
- Flash V37 firmware for enhanced power management optimizations
- If battery degradation confirmed, replace with genuine 4000mAh battery
4. Unresponsive Fingerprint Scanner
- Symptoms: Fingerprint not recognized, sensor inactive, delayed response, calibration failures.
- Clean fingerprint sensor with microfiber cloth, ensure dry fingers
- Delete existing fingerprints and re-register with multiple finger angles
- Check for screen protector interference (enable high touch sensitivity)
- Flash V37 firmware for updated fingerprint sensor drivers
- If sensor remains non-functional, hardware replacement required
5. Wi-Fi Connectivity and Network Issues
- Symptoms: Wi-Fi disconnecting frequently, slow internet, mobile data failures.
- Reset network settings: Settings > System > Reset > Reset Wi-Fi, mobile & Bluetooth
- Enable automatic date/time to prevent certificate conflicts
- Forget problematic networks and reconnect with fresh credentials
- Update to V37 firmware for improved network stack stability
- If persistent, check router compatibility and contact ISP
6. Overheating and Performance Issues
- Symptoms: Device gets excessively hot, performance lag, thermal throttling, app crashes.
- Remove phone case during intensive use for better heat dissipation
- Close background apps and disable unnecessary location services
- Avoid charging while using intensive apps or gaming
- Enable battery saver mode during extended use periods
- Flash V37 firmware for optimized thermal management algorithms
Advanced Recovery and TWRP Options
For advanced users seeking custom recovery installation, the Cubot X18 Plus supports TWRP Recovery 3.2.1 for custom ROM flashing and advanced modifications.
TWRP Installation Benefits:
- Custom ROM support including LineageOS and AOSP GSI
- Magisk root installation for advanced modifications
- Complete Nandroid backup and restore capabilities
- Advanced partition management and repair options
Installation Requirements:
- Unlocked bootloader (voids warranty)
- USB debugging and OEM unlock enabled
- Fastboot/ADB tools properly installed
For detailed TWRP installation guide, visit: TWRP Recovery for Cubot X18 Plus MT6750T.
Performance Optimization Tips
- Keep at least 15GB internal storage free for optimal system performance
- Restart device every 2-3 days to clear memory leaks and temporary files
- Use “Lite” versions of heavy apps (Facebook Lite, Messenger Lite) to reduce RAM usage
- Clean camera lenses regularly for optimal dual camera performance
- Avoid overnight charging to prevent battery degradation
- Monitor CPU usage and close resource-intensive background processes
- Update Google Play Services regularly for security and performance improvements
Frequently Asked Questions
- Is the Cubot X18 Plus eligible for Project Treble GSI ROMs?
- Yes, the X18 Plus ships with Android 8.0 and supports Project Treble, enabling installation of Generic System Images (GSI) including Android 10 AOSP.
- Why does my dual camera produce poor quality photos despite 20MP specifications?
- The primary sensor is 16MP interpolated to 20MP, while the secondary is 2MP depth sensor. V37 firmware improves camera algorithms, but hardware limitations remain.
- Will flashing firmware void my Cubot warranty?
- Flashing official stock firmware typically does not void warranty, but unlocking bootloader for custom ROMs will. Check local warranty terms before proceeding.
- Can I upgrade to newer Android versions beyond 8.0?
- Official support ends at Android 8.0 due to MT6750T chipset limitations. Custom ROMs via Project Treble can provide Android 9-11 experiences but with potential stability issues.
- What should I do if SP Flash Tool shows “PMT changed for the ROM” error?
- This indicates partition table mismatch. Ensure you’re using correct firmware for your exact device model and region. Consider using “Format All + Download” mode as last resort.
Expert Recommendations for Best Results
- Always use V37 (April 2019) firmware for maximum stability and feature refinements
- Maintain 15GB+ free storage to prevent performance degradation and bootloop issues
- Regularly clean fingerprint sensor and camera lenses for optimal functionality
- Use original charging accessories to prevent battery and heating problems
- Enable developer options battery optimization for extended usage periods
- Create regular backups via Google account sync and local storage
- Monitor system temperature during intensive use and gaming sessions
Conclusion
Flashing the official Cubot X18 Plus V37 stock firmware provides comprehensive solutions for bootloop crashes, dual camera coordination issues, battery drain problems, and fingerprint scanner malfunctions. The April 2019 V37 release represents the most stable and feature-complete firmware available for this MediaTek MT6750T-powered device.
With proper SP Flash Tool usage and following safety protocols, users can restore their Cubot X18 Plus to factory-fresh performance while resolving persistent software and hardware-related issues. For advanced users, TWRP recovery installation opens possibilities for custom ROMs and deep system modifications.
Success? Share your experience in the comments, especially if you resolved dual camera issues or eliminated bootloop problems. Your feedback helps other Cubot X18 Plus users maintain their devices successfully!
