This page provides the official download link for the Celkon Q4G Plus stock ROM. The Q4G Plus was an early entry into the budget 4G smartphone market in India, offering essential connectivity features. If your device is stuck on the Celkon logo, has been soft-bricked by a failed update, or is suffering from critical software errors like an “Invalid IMEI,” reinstalling the official firmware is the most reliable solution. This package contains the original Android 5.1 Lollipop software for the MediaTek MT6735M-powered device.
By using the SP Flash Tool, this firmware allows you to perform a clean installation of the operating system, which is the best way to unbrick a Celkon Q4G Plus, remove all viruses, and resolve deep-seated software glitches. 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 Q4G Plus. A full backup is essential.
Celkon Q4G Plus: Quick Device Specifications
Please confirm these details match your phone to ensure you are using the correct firmware file.
- Device Model:
- Celkon Q4G Plus
- Release Date:
- Circa 2016
- Chipset:
- MediaTek MT6735M (Quad-core 1.0 GHz Cortex-A53)
- Display:
- 5.0 inches, 720 x 1280 pixels (HD)
- Battery:
- 2200 mAh
- RAM/Storage:
- 1GB RAM / 8GB Internal Storage
- Key Features:
- 4G LTE Support
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 Q4G Plus Firmware Package (from the table below)
Celkon Q4G Plus Firmware Download Links
| Filename / Version (Build Date) | Android Version | Size | Download Link/s |
|---|---|---|---|
| Celkon_Q4G_Plus_V02 (Jan 2016) | 5.1 Lollipop | 790MB | Download (Google Drive) |
How to Flash Celkon Q4G Plus 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 theMT6735M_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 Q4G Plus 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
Here are some specific issues you might encounter with the Celkon Q4G Plus.
1. “Invalid IMEI” or SIM Card Not Working
Cause: This is a very common issue on MediaTek devices. It happens when the NVRAM partition, which stores your phone’s unique IMEI numbers, gets 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 lost, flashing this stock ROM is a necessary first step, but it will not restore the IMEI by itself. You will need to find your original IMEI (on the phone’s box or sticker) and use advanced tools like Maui META to write it back to the device.
2. Unstable 4G/LTE Connection
Cause: If your mobile data connection is unstable or frequently drops, it can be caused by corrupted modem files or incorrect network settings, often after a failed software update.
Solution: A full firmware flash with this package restores the original, factory-tested radio and baseband firmware for the MT6735M chipset. This process often resolves software-based connectivity issues and stabilizes the 4G LTE connection.
3. Device is Unresponsive or Dead (Hard Brick)
Cause: A failed update, incorrect file flash, or a critical system error can cause the phone to become completely unresponsive.
Solution: SP Flash Tool is excellent at recovering from this state. As long as your PC can detect the phone’s MTK Preloader port when you plug it in (you might hear a connection sound), the tool can force-flash the stock firmware and bring the device back to life.
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.
- My SIM card is not detected after flashing. What do I do?
- This is the most common symptom of an “Invalid IMEI” or null IMEI number. Your phone cannot register on a network without this unique identifier. Please refer to the first point in our troubleshooting section above for more information.
- Is this phone the same as the Celkon Diamond Q 4G Plus?
- They are very similar devices with many shared specifications. However, they are distinct models, and their firmware files are not interchangeable. You must use the firmware specifically made for the Q4G Plus.
- What does a BROM ERROR in SP Flash Tool mean?
- This is a communication error, usually caused by incorrect VCOM drivers. Ensure the drivers are properly installed (you may need to disable driver signature enforcement on Windows). Also, try using a different USB cable or port and make sure you connect the phone *after* clicking the “Download” button.
Conclusion
Restoring the official stock firmware on your Celkon Q4G Plus is the most reliable way to fix major software issues, from a bootloop to critical IMEI and network problems. 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!
