Celkon Ace A25 Firmware Flash File Download [Stock Rom]

This page provides the official download link for the Celkon Ace A25 stock ROM. The Ace A25 is an entry-level smartphone built on a Spreadtrum (SPD) processor. If your phone is stuck on the Celkon logo, has been infected with persistent viruses or adware, or is completely dead (soft-bricked), flashing the stock firmware is the most effective solution. This package contains the original Android 6.0 Marshmallow software in a .pac file format, which is designed to be installed with the SPD Upgrade Tool.

Reinstalling the firmware will perform a deep format of your device’s storage, completely removing all data, locks, and malware. It is the definitive method to unbrick a Celkon Ace A25 and restore it to its original factory condition. Please follow the instructions carefully, as the process for Spreadtrum devices is different from others.

Celkon Ace A25: Quick Device Specifications (Estimated)

The Celkon Ace A25 is a rare entry-level device with limited public information. The specifications below are estimated based on the chipset and typical hardware for this category.

Device Model:

Celkon Ace A25

Release Date:

Circa 2017

Chipset:

Spreadtrum (SPD) SC-series

Display:

Estimated 4.0 – 4.5 inches

Battery:

Estimated 1500-2000 mAh

RAM/Storage:

512MB or 1GB RAM / 4GB or 8GB Internal Storage

Original OS:

Android 6.0 Marshmallow

Required Downloads for Flashing

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

• SPD Upgrade Tool
• Spreadtrum USB Drivers
• The Celkon Ace A25 Firmware Package (from the table below)

Celkon Ace A25 Firmware Download Links

How to Flash Celkon Ace A25 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 and extract the firmware, SPD Upgrade Tool, and Spreadtrum drivers to a folder on your PC.
2. Driver Installation: Install the Spreadtrum USB drivers. You may need to restart your computer after the installation is complete.
3. Load Firmware: Launch UpgradeDownload.exe. Click the first Gear icon (“Load Packet”) and navigate to the extracted firmware folder to select the .pac file. It may take a moment to load.
4. Start Flashing: Click the third icon, the Play button (“Start Downloading”), to put the tool in standby mode, ready to flash.
5. Connect the Phone: Power off your Celkon Ace A25 completely. Press and hold the Volume Down key. While holding the key, connect the phone to your computer via USB cable.
6. Completion: The tool will detect the phone and the flashing process will begin. You can release the volume key. The process is finished when you see a green “Passed” message. You can then disconnect the phone and power it on.

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 Ace A25.

1. Phone is Infected with Persistent Viruses or Adware

Cause: Entry-level devices are often targeted by malware that embeds itself deep into the system. A factory reset is often not enough to remove it.

Solution: Flashing the .pac firmware is the most effective solution. This process completely formats and rewrites the entire storage of the phone, guaranteeing the removal of all viruses, malware, and adware and restoring it to a clean, secure state.

2. SPD Upgrade Tool Shows an Error or is Stuck

Cause: Errors like “Failed: Uart send error” or the tool being stuck on “Checking baudrate” are almost always caused by driver issues or an improper connection sequence.

Solution: First, ensure the Spreadtrum drivers are correctly installed. Try a different USB port and cable. Most importantly, follow the connection sequence exactly: click “Start,” then hold the volume key, then connect the phone. If one volume key doesn’t work, try holding Volume Up or both volume keys together.

3. Extremely Slow Performance and Low Storage

Cause: This is a hardware limitation of the Celkon Ace A25. With minimal RAM (likely 512MB or 1GB) and storage (4GB or 8GB), the phone will struggle with modern demands.

Solution: A clean firmware flash provides the best possible starting point. After flashing, avoid installing unnecessary apps. Use “Go” or “Lite” versions of popular apps if available. Regularly clear the cache and use an SD card for media storage to keep the internal memory as free as possible.

Frequently Asked Questions (FAQs)

Will this firmware remove a forgotten password or pattern lock?

Yes. The flashing process erases all user data on the phone, which includes any screen lock security like PINs, passwords, or patterns. Your phone will be reset to factory settings with no lock.

Why doesn’t the SPD Upgrade Tool detect my Celkon Ace A25?

The most common reason is that the Spreadtrum drivers are not installed correctly. The second reason is not using the correct “boot key.” Power the phone off, click Start in the tool, then press and hold either Volume Down or Volume Up *before* you plug in the USB cable.

Can I install modern apps like Instagram or TikTok on this phone?

It is not recommended. The Celkon Ace A25 has very limited RAM and storage, and runs an old version of Android. Modern, resource-heavy apps will likely not install or will run very poorly and crash frequently.

Is flashing a .pac file safe?

It is a standard procedure for servicing Spreadtrum phones. As long as you are using the correct .pac file for your exact phone model (in this case, the Celkon Ace A25), the process is generally safe and is the best way to fix major software issues.

Conclusion

Restoring the official stock firmware on your Celkon Ace A25 is the ultimate solution for fixing critical software problems, from bootloops to stubborn malware infections. This guide provides the authentic firmware and a reliable method using the SPD Upgrade Tool to get your device back into working order. Given the device’s age, this process is ideal for restoring it for basic tasks or as a backup phone.

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