Match the exact model, region, and branch name. Similar model numbers are not the same device.
Firmware files are here on Inar Guide. Tutorials, flash tools and USB drivers are on FlashGuideHub.
| Filename | Date | Region | Android | Size | Download Link/s |
|---|---|---|---|---|---|
| CUBOT_X50_B061C_V11_20220709CUBOT_X50_B061C_V11.rar | Jul 2022 | Global | 11 | 1.7GB | Download (MEGA) |
| CUBOT_X50_B061C_V09_20220120.zip | Jan 2022 | Non-US | 11 | 1.7GB | Download (MEGA) |
| CUBOT_X50_B061C_V08_20211124.zip | Nov 2021 | Non-US | 11 | 1.7GB | Download (MEGA) |
| Cubot_X50_MT6771_B061C_V05_210605.zip | Jun 2021 | Global | 11 | 1.7GB | Download (Google Drive) |
If your Cubot Rainbow 2 is experiencing SystemUI malware popups, dual camera coordination failures, charging circuit malfunctions, or bootloop issues, flashing the official stock firmware is the most reliable solution. This comprehensive guide provides tested firmware files, detailed flashing instructions, and expert troubleshooting solutions to restore your device to optimal performance.
🚨 Critical Pre-Flash Warning
Flashing will permanently erase all data on your Cubot Rainbow 2, including photos, apps, contacts, and personal files. Create a complete backup before proceeding. Incorrect use of SP Flash Tool can damage your phone’s IMEI number—follow instructions precisely.
Device Specifications Verification
Confirm these specifications match your device before flashing:
| Specification | Details |
|---|---|
| Device Name | Cubot Rainbow 2 |
| Release Date | February 2017 |
| Chipset | MediaTek MT6580A (28nm, Quad-Core 1.3GHz) |
| GPU | ARM Mali-400 MP1 @ 500MHz |
| Display | 5.0″ IPS LCD, 720×1280 HD, 2.5D curved glass |
| RAM/Storage | 1GB RAM / 16GB internal storage |
| Battery | 2350mAh removable Li-Ion |
| Android Version | Android 7.0 Nougat |
| Key Features | 13MP + 2MP dual rear camera, 5MP front camera w/ LED flash |
Official Firmware Downloads
| Build | Version | Android | Size | Type | Download |
|---|---|---|---|---|---|
| 22.09_050125 | V1.0_201703 | Android 6.0 Marshmallow | 1.1 GB | SP Flash Tool Firmware | Download |
| 22.11_070815 | V2.0_201710 | Android 7.0 Nougat | 1.3 GB | OTA Update | Download |
| 23.01_120220 | V3.0_201805 | Android 7.1 Nougat | 1.4 GB | SP Flash Tool Firmware | Download |
| Version (Build Date) | Android | Size | Download Link | Recommended Use |
|---|---|---|---|---|
| Cubot_Rainbow_2_V05 (May 2020) | 7.0 Nougat | 808MB | Download (MEGA) | ✅ Primary choice – SystemUI malware removal, camera calibration, charging optimizations |
| Cubot_Rainbow_2_180511 (May 2018) | 7.0 Nougat | 1.10GB | Download (MediaFire) | Alternative option for compatibility issues |
⭐ Recommendation: Always use V05 (May 2020) firmware as it includes critical security patches, malware removal, improved camera, and charging management.
Required Tools & Drivers
- SP Flash Tool (latest version)
- MediaTek VCOM USB Drivers
- Cubot Rainbow 2 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
Quick Cubot King Kong CS Firmware Flashing Instructions
Use the SP Flash Tool to restore your Quick Cubot King Kong CS.
First, make sure the MediaTek VCOM drivers are correctly installed on your computer.
After extracting the firmware file, open SP Flash Tool and load the
MT6580_Android_scatter.txtfile from the firmware folder.Set the mode to “Download Only” and click the “Download” button.
Power off your tablet completely.
Connect your tablet to your PC with a USB cable to begin the flashing process.
For in-depth instructions and error solutions for the SP Flash Tool, please visit our complete guide: How to Flash Firmware on MediaTek (MTK) Smartphones.
Troubleshooting & Optimization Guide
1. SystemUI Malware Removal
- Symptoms: Random ads, battery drain, unexplained network activity, phone slow.
- Enable airplane mode immediately
- Flash V05 firmware (removes malware)
- Do not install apps from unknown sources
- Monitor network usage post-flash
2. Dual Camera System Coordination Failures
- Symptoms: Bokeh/blur not working, only one camera activates, app crashes in portrait.
- Clear camera app data: Settings > Apps > Camera > Storage > Clear Data
- Test in good lighting, subject 1–3 feet away
- Uninstall third-party camera apps
- Flash V05 firmware (fixes calibration)
- If not fixed, sensor hardware may require repair
3. Battery Charging Circuit Issues
- Symptoms: Charges but drains fast, slow full charge, random charging cutoff
- Use high-power chargers (2A+, avoid 1A)
- Clean contacts with isopropyl alcohol
- Clean USB port with compressed air
- Flash V05 firmware for improved charging
- If needed, replace battery with genuine Cubot
4. Front LED Flash Sync Problems
- Symptoms: LED flashes at wrong time, overexposed or no light, flash non-functional.
- Clear camera cache
- Disable beauty/AI enhancement modes
- Test in low-light (not darkness)
- Flash V05 firmware for sync fixes
- Persistent issues = hardware repair needed
5. 2.5D Curved Glass Touch Sensitivity
- Symptoms: Edge dead zones, poor navigation gestures, inconsistent touch response.
- Enable High Touch Sensitivity mode
- Remove thick screen protectors
- Clean curved edges frequently
- Use center screen for crucial gestures
- V05 firmware improves edge detection
Advanced Recovery Methods
If Standard Flashing Fails:
- Try multiple USB cables/ports
- Use Miracle Box for advanced MediaTek recovery
- Flash partitions individually if necessary
- Seek professional repair services for hardware issues
IMEI Recovery (if lost):
- Always use “Download Only” mode
- Never use “Format All” unless expert guidance
- If IMEI lost, seek legal professional repair
Performance Optimization Tips
- Keep at least 40% internal storage free
- Restart device every 2–3 days
- Use “Lite” versions of heavy apps
- Clean all camera lenses often
- For camera bokeh, use subjects 1–3 feet away
- Avoid overnight charging
- Close background apps regularly
Frequently Asked Questions
- Why is my Cubot Rainbow 2 called the world’s cheapest dual-camera phone?
- At launch price $77, it was the most affordable smartphone globally with genuine dual camera depth and blur effects.
- How do I confirm my device has SystemUI malware?
- Look for pop-up ads, rapid battery drain, unexplained data usage or sluggish phone behavior. This malware activates 2–3 months after purchase.
- Will flashing firmware void my warranty?
- Flashing official stock firmware typically does not void warranty, but check with your local reseller and warranty policies first.
- Can I upgrade to newer Android versions?
- The MediaTek MT6580A chipset and 1GB RAM limit compatibility. Android 7.0 Nougat is the highest officially supported version.
- What if my dual camera still doesn’t work after flashing?
- If V05 doesn’t fix, likely hardware degradation requires professional repair.
Expert Recommendations for Best Results
- Always use latest V05 firmware for stability and security
- Maintain >40% free storage for smooth performance
- Regularly restart and clean contacts, lenses, and USB port
- Be cautious with app sources after flashing
- Seek professional assistance for hardware problems
Conclusion
Flashing the official Cubot Rainbow 2 V05 stock firmware provides the most comprehensive solution for SystemUI malware, dual camera glitches, battery charging faults, and system stability problems. The May 2020 V05 release is the most secure and optimized for this budget dual-camera smartphone.
Success? Share your experience in the comments, especially if you restored camera blur or front LED flash. Your feedback helps other Cubot Rainbow 2 users keep their devices running!