This page provides the official download link for the Celkon Diamond Pro stock ROM, version V18. The Diamond Pro was a mid-range 4G smartphone from 2015, featuring a durable Asahi Dragontrail Glass display and a capable 2GB of RAM. If your device is suffering from common issues like overheating, is stuck in a bootloop, or has been soft-bricked, reinstalling the official firmware is the best solution. This package contains the original Android 5.1 Lollipop software for the MediaTek MT6735-powered device.
Using the SP Flash Tool, this firmware allows you to perform a clean installation of the operating system. It is the definitive method to unbrick a Celkon Diamond Pro, remove pre-installed bloatware for a cleaner experience, and resolve deep-seated software glitches that a factory reset cannot fix. Please follow the instructions and warnings below to ensure a safe and successful process.
Immediate Notice: This flashing process will permanently erase all your personal data (photos, contacts, etc.) from your Celkon Diamond Pro. A full backup is essential.
Celkon Diamond Pro: Quick Device Specifications
Please confirm these details match your phone to ensure you are using the correct firmware file.
- Device Model:
- Celkon Diamond Pro
- Release Date:
- 2015
- Chipset:
- MediaTek MT6735 (Quad-core 1.3 GHz Cortex-A53)
- Display:
- 5.0 inches, 720 x 1280 pixels (HD) with Asahi Dragontrail Glass
- Battery:
- 2500 mAh, Removable Li-Ion
- RAM/Storage:
- 2GB RAM / 16GB Internal Storage
- Key Features:
- 4G LTE Support, Scratch-Resistant Glass
Required Downloads for Flashing
You will need the following tools and drivers to flash your phone.
- SP Flash Tool (Latest Version)
- MediaTek VCOM USB Drivers
- The Celkon Diamond Pro Firmware Package (from the table below)
Celkon Diamond Pro Firmware Download Links
| Filename / Version (Build Date) | Android Version | Size | Download Link/s |
|---|---|---|---|
| Celkon_Diamond_Pro_V18 (Nov 2015) | 5.1 Lollipop | 789MB | Download (MediaFire) |
How to Flash Celkon Diamond Pro Firmware
This is a summary of the flashing process using SP Flash Tool. For a more comprehensive guide with screenshots, please visit our detailed pillar article.
- Preparation: Download and extract the firmware, SP Flash Tool, and MTK VCOM drivers to a dedicated folder on your computer.
- Driver Installation: Install the MediaTek VCOM drivers. You may need to disable driver signature enforcement on modern Windows versions for the drivers to install correctly.
- Load Firmware in Tool: Launch
flash_tool.exe. Click on the “Scatter-loading File” button, navigate to the extracted firmware folder, and select theMT6735_Android_scatter.txtfile. - Begin Flashing: Set the dropdown box to “Download Only”. This is a critical step to avoid erasing your phone’s IMEI number. Click the large green “Download” button to put the tool in standby.
- Connect the Phone: Power off your Celkon Diamond Pro completely. Press and hold the Volume Down key and connect the phone to your PC with a USB cable. Release the key once the flashing process begins. A green tick will appear in the tool when it has finished successfully.
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 Common Issues
Based on user reports for the Celkon Diamond Pro, here are some specific problems and their solutions.
1. Phone Overheats, Especially During Charging or 4G Use
Cause: This was a common complaint for this model. While the MediaTek MT6735 chipset can run warm under load, excessive heat is often caused by software inefficiencies, rogue background processes, or even pre-installed bloatware putting a constant strain on the CPU.
Solution: A clean flash of the stock ROM is the best way to address software-related overheating. It removes all third-party apps and bloatware, and restores the phone’s original thermal management files, which can help regulate temperature more effectively during charging and data usage.
2. GPS is Very Slow to Lock-On or is Inaccurate
Cause: Some users reported that the GPS performance on the Diamond Pro was weak, taking several minutes to get an accurate location fix. This can be caused by corrupted A-GPS (Assisted GPS) data on the device.
Solution: Flashing the stock ROM resets the GPS configuration. After the first boot, ensure Location services are enabled on High Accuracy, connect to Wi-Fi, and go outdoors with a clear view of the sky for 5-10 minutes. This allows the GPS to perform a “cold start” and download fresh satellite data, which can significantly improve lock-on times.
3. “Invalid IMEI” or No SIM Card Detected After Flashing
Cause: This is a serious issue common to MediaTek devices. It occurs when the NVRAM partition, which stores your phone’s unique IMEI numbers, is corrupted or erased. This is almost always caused by using the “Format All + Download” option in SP Flash Tool.
Solution: Always flash using the “Download Only” mode. If your IMEI is already gone, this firmware flash will not restore it. Restoring a lost IMEI is a complex process requiring specialized tools like Maui META and your phone’s original IMEI number (found on the box or under the battery).
Frequently Asked questions (FAQs)
- Will this firmware update my phone to Android 6.0 Marshmallow?
- No. This is the official stock firmware for the device, which is based on Android 5.1 Lollipop. It will not upgrade your Android version.
- What is Asahi Dragontrail Glass?
- Asahi Dragontrail is a brand of hardened, scratch-resistant glass used for smartphone displays, similar to Corning’s Gorilla Glass. It was a premium feature for a budget device at the time, offering better protection against scratches and minor drops.
- My phone is bricked and won’t turn on. Can SP Flash Tool still fix it?
- Yes, in many cases. SP Flash Tool is capable of reviving “hard-bricked” MediaTek devices that won’t power on. As long as your computer can still detect the MTK Preloader port when you connect the phone (often with a brief connection sound), the tool can force the firmware onto the device and bring it back to life.
- Why does my SIM card not work after I flashed my phone?
- This is the primary symptom of an “Invalid IMEI” or null IMEI number. Without this unique identifier, your phone cannot register on any cellular network. Please refer to the third point in our troubleshooting section for more information on this critical issue.
Conclusion
Restoring the official stock firmware on your Celkon Diamond Pro is the most effective method for fixing major software issues, from specific problems like overheating to a complete bootloop. This guide provides the authentic firmware and a safe flashing method to get your device back into working order. Remember to be very careful with the flashing options to protect your device’s IMEI number, and always back up your data first.
If this guide helped you, please share your experience in the comments. Your feedback helps our community!
