Celkon Swift 4G Firmware Flash File Download [Stock Rom]

This page provides the official download link for the Celkon Swift 4G stock ROM, version V09. The Swift 4G is a budget-friendly smartphone from 2017 designed to offer essential 4G VoLTE features in a straightforward package. If your device is stuck in a bootloop, has been compromised by malware, or is experiencing software-related network issues, flashing the stock firmware is the most reliable solution. This package contains the original Android 7.0 Nougat software in a .pac file format, designed to be installed with the SPD Upgrade Tool on its Spreadtrum chipset.

Reinstalling the firmware will perform a complete factory reset, wiping all data and resolving deep-seated software errors. It is the definitive method to unbrick a Celkon Swift 4G and restore it to its original, stable condition. Please follow the instructions carefully to ensure a successful flash.

Celkon Swift 4G: Quick Device Specifications

Please confirm these details match your device to ensure you are using the correct firmware file.

Device Model:

Celkon Swift 4G

Release Date:

October 2017

Chipset:

Spreadtrum SC9832 (Quad-core 1.3 GHz)

Display:

5.0 inches, 480 x 854 pixels (FWVGA)

Battery:

2000 mAh, Removable Li-Ion

RAM/Storage:

1GB RAM / 8GB Internal Storage

Key Features:

4G VoLTE Support

Required Downloads for Flashing

You will need the following specific tools and drivers for Spreadtrum devices.

• SPD Upgrade Tool
• Spreadtrum USB Drivers
• The Celkon Swift 4G Firmware Package (from the table below)

Celkon Swift 4G Firmware Download Links

How to Flash Celkon Swift 4G Firmware (.pac file)

This is a summary of the flashing process using SPD Upgrade Tool. For a more comprehensive guide with screenshots, please visit our detailed pillar article.

1. Preparation: Download the firmware, SPD Upgrade Tool, and Spreadtrum drivers. Extract all zip files into a single folder on your PC.
2. Driver Installation: Install the Spreadtrum USB drivers. A computer restart may be required for them to function correctly.
3. Load Firmware: Run UpgradeDownload.exe. Click the first Gear icon (“Load Packet”) and select the .pac firmware file from the folder you extracted.
4. Start Flashing: Click the Play button (“Start Downloading”) to prepare the tool for flashing.
5. Connect the Phone: Power off your Celkon Swift 4G completely. Press and hold the Volume Down key. While holding the key, connect the phone to your PC with a USB cable.
6. Completion: The tool will detect the phone and the flashing will begin. You can release the volume key once the progress bar starts moving. A green “Passed” message will appear when the process is complete. You can now disconnect and power on your phone.

For in-depth instructions and troubleshooting for the SPD Upgrade Tool, please visit our complete guide: How to Use the SPD Upgrade Tool to Flash Your Smartphone.

Troubleshooting Common Issues

Here are some specific issues you might encounter with the Celkon Swift 4G.

1. 4G VoLTE Not Working or No Network Signal

Cause: If your phone can’t make calls over 4G or has no signal, it could be due to corrupted modem firmware, especially after a failed update or rooting attempt.

Solution: A full flash with the official .pac file is the best fix. It restores the original, factory-tested radio and baseband firmware, which can resolve software-based connectivity problems and restore VoLTE functionality.

2. SPD Upgrade Tool is Stuck or Fails to Start

Cause: This issue, often indicated by the tool being stuck on “Checking Baudrate,” is almost always related to drivers not being installed correctly or the phone not being in the right mode.

Solution: Reinstall the Spreadtrum drivers and restart your PC. Use a different USB port and a known-good cable. Most importantly, follow the connection sequence precisely: power off the phone, click “Start” in the tool, press and hold Volume Down, then plug in the cable.

3. Persistent Malware or Adware

Cause: Entry-level phones can sometimes be targeted by malicious apps that install themselves as system services, making them difficult to remove.

Solution: A complete firmware flash via SPD Upgrade Tool is the only guaranteed way to remove such infections. The process formats the entire user and system data partitions, wiping out all traces of the malware.

Frequently Asked Questions (FAQs)

Will this firmware remove the FRP (Google Account) lock on my Celkon Swift 4G?

Yes, it is highly likely. Flashing a full .pac firmware with the SPD Upgrade Tool typically overwrites the partition that stores the FRP data, effectively removing the lock. This is a common method for bypassing FRP on Spreadtrum devices.

Why is my phone so slow after flashing the new firmware?

While the firmware flash provides a clean system, the Celkon Swift 4G has entry-level hardware (1GB of RAM). Android 7.0 Nougat can be demanding for these specs. To maintain the best possible performance, avoid installing many apps and use lightweight “Go” or “Lite” versions where available.

What is the difference between the Celkon Swift 4G and the Star 4G Plus?

The two phones are very similar, both featuring a Spreadtrum SC9832 chipset, 1GB RAM, and 8GB storage. The main differences are minor, such as the Swift 4G having a slightly smaller battery (2000 mAh vs 2200 mAh) and potential design variations.

Can I upgrade to a newer version of Android with this file?

No. This is the official Android 7.0 Nougat firmware for the Celkon Swift 4G. It cannot be used to upgrade to a newer Android version like Oreo.

Conclusion

Restoring the official stock firmware on your Celkon Swift 4G is the most effective way to solve major software issues, from a bootloop to persistent network problems or malware. This guide provides the authentic firmware and a reliable flashing method to get your device back into working order. Remember to back up your data before starting, and be mindful of the security limitations of using an older Android version.

If this guide helped you, please share your experience in the comments. Your feedback helps our community!