Q1. My phone has a virus that keeps opening ads and installing apps. Will this firmware remove it?

Yes, absolutely. Flashing the stock ROM is the most effective way to remove deep-seated malware and viruses. It completely overwrites the existing system software, eliminating any malicious code that a factory reset might leave behind.

Q2. Can I use this to bypass the Google Account (FRP) lock on my BQ-5031G Fun?

Yes. If you have factory reset your phone and are now stuck on the Google account verification screen (FRP lock), flashing this firmware will remove the lock and allow you to set up the device from scratch.

Q3. Will this make my phone faster?

It will restore the phone to its original factory performance. While the 1GB of RAM is a hardware limitation, a clean firmware installation removes all the junk files, cached data, and background processes that accumulate over time and cause the device to slow down.

BQ Mobile BQ-5031G Fun Firmware (Stock ROM)

The BQ Mobile BQ-5031G Fun is an ultra-budget smartphone running Android 10 (Go Edition), tailored for essential tasks like calls, messaging, and light web browsing. Given its modest hardware specifications, the device can become slow or unstable over time due to software clutter, corrupted files, or even malware. If your BQ-5031G Fun is stuck in a bootloop, infected with a virus, or suffering from severe performance lag, flashing the official stock firmware is the most comprehensive solution to restore its functionality.

ℹ️ Important Note:
This phone is powered by a UNISOC (Spreadtrum) chipset. The flashing process requires the SPD Upgrade Tool and will completely erase all your personal data. Ensure you have a backup of your important files before you start.

⚠️ Prerequisites: Before You Begin

Click Here for the Essential Pre-Flashing Checklist

Backup Your Data: All your contacts, photos, and files on the internal storage will be permanently wiped.
Charge The Battery: To prevent the phone from shutting down during the update, ensure the battery is charged to at least 50%.
Windows PC & USB Cable: You will need a Windows computer and a standard micro USB cable to perform the flash.

📱 Quick Device Specifications

Device: BQ Mobile BQ-5031G Fun
Chipset: UNISOC SC7731E
Display: 5.0″ TN (480×854)
Operating System: Android 10 (Go Edition)
RAM: 1GB
Storage: 32GB
Battery: 2000 mAh

🛠 Required Tools & Downloads

File / Tool	Download Link
SPD Upgrade Tool	Download Tool
UNISOC/SPD SCI USB Drivers	Download Drivers

⬇️ BQ Mobile BQ-5031G Fun Stock ROM / Firmware

Android Version	Build Number	Chipset	Download Link
10 (Go Edition)	V05_210407	UNISOC SC7731E	Download (Google Drive)

⚡ Quick Flashing Guide

Download and install the SPD SCI USB Drivers on your Windows PC.
Extract the firmware ZIP file (BQ_Mobile_BQ-5031G_V05_210407_SPD.zip) to get the .pac file inside.
Extract and run the SPD Upgrade Tool (UpgradeDownload.exe).
Click the single gear icon (“Load Packet”) and select the firmware .pac file.
Click the play icon (“Start Downloading”). Power off your phone completely.
Press and hold the Volume Down key, and while holding it, connect the phone to the PC. The tool will detect the phone and start flashing. You can release the key once the progress bar appears.
A green “Passed” message will appear upon completion. Disconnect your phone and power it on.

For a more detailed, step-by-step guide on this process, please refer to our main tutorial:
👉 Full Tutorial: How to Flash Firmware with the SPD Upgrade Tool

❓ Frequently Asked Questions (FAQs)

Q1. My phone has a virus that keeps opening ads and installing apps. Will this firmware remove it?: Yes, absolutely. Flashing the stock ROM is the most effective way to remove deep-seated malware and viruses. It completely overwrites the existing system software, eliminating any malicious code that a factory reset might leave behind.
Q2. Can I use this to bypass the Google Account (FRP) lock on my BQ-5031G Fun?: Yes. If you have factory reset your phone and are now stuck on the Google account verification screen (FRP lock), flashing this firmware will remove the lock and allow you to set up the device from scratch.
Q3. Will this make my phone faster?: It will restore the phone to its original factory performance. While the 1GB of RAM is a hardware limitation, a clean firmware installation removes all the junk files, cached data, and background processes that accumulate over time and cause the device to slow down.

🔧 Device Troubleshooting

The Upgrade Tool is Stuck on “Checking BAUD”: This is a driver or connection issue. First, ensure the SPD drivers are properly installed. Try a different USB port and cable. Most importantly, make sure the phone is completely off and that you are pressing and holding the Volume Down button before you connect the USB cable to the computer.
Flashing Fails with an Error: If the process fails midway, the firmware file might be corrupted. Re-download the .zip file and extract the .pac file again. Also, ensure you are running the UpgradeDownload.exe as an administrator.
Phone is Dead or Won’t Turn On After Flashing: After seeing the “Passed” message, the first boot can take several minutes. If it doesn’t turn on, try holding the Power button for 15-20 seconds. If the battery is removable, take it out and re-insert it. Then, charge the phone for at least 30 minutes before attempting to power it on again.