Q1. My phone is called "Wallet" but the NFC for Google Pay has stopped working. How do I fix it?

This is the most common issue for this model and is almost always a software problem. Flashing the official stock firmware is the most reliable way to fix it, as it reinstalls the NFC controller's firmware and the necessary system services for contactless payments to function.

Q2. Why does my phone freeze and show "System UI has stopped"?

This error indicates a critical corruption of the Android interface files, often caused by the limited 1GB of RAM being overloaded. A clean firmware flash is the best solution as it replaces all damaged files and restores the system's stability.

Q3. The 4G LTE signal is very unstable and often drops. Will this help?

Yes. Unstable mobile data is often a modem firmware issue. Reinstalling the stock ROM from this page restores the entire radio partition and baseband drivers, which is a proven fix for software-based signal dropping problems.

BQ-5045 Wallet Stock ROM (Firmware) | Fix NFC & System Errors

The BQ Mobile BQ-5045 Wallet is a compact 4G smartphone that runs on Android 10 (Go Edition). Its key feature, as highlighted by its name, is the inclusion of an NFC chip for contactless payments, a rare feature in its class. However, the most significant issue reported by users is the NFC function failing to work, which defeats the phone’s main purpose. Other common complaints include critical system errors like “System UI has stopped,” frequent freezes, and unstable 4G connectivity. For users facing these problems, flashing the official stock firmware is the most effective solution to restore the NFC functionality and overall system stability.

ℹ️ Important Note:
This phone is powered by a MediaTek chipset and requires the SP Flash Tool to install the firmware. This process will completely erase all your personal data. Ensure you have backed up your important files before you begin.

⚠️ Prerequisites: Before You Begin

Click Here for the Essential Pre-Flashing Checklist

Backup Your Data: All your contacts, photos, and files on the phone’s 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-5045 Wallet
Chipset: MediaTek MT6739
Display: 5.0″ IPS (960×480)
Operating System: Android 10 (Go Edition)
RAM: 1GB
Storage: 16GB
Battery: 2000 mAh (Removable)

🛠 Required Tools & Downloads

File / Tool	Download Link
SP Flash Tool	Download Tool
MediaTek USB VCOM Drivers	Download Drivers

⬇️ BQ Mobile BQ-5045 Wallet Stock ROM / Firmware

Two versions of the firmware are available. It is recommended to use the newest version (V05) for the latest fixes and stability improvements.

Android Version	Filename	Release Date	Size	Download Link
10 (Go Edition)	BQ_Mobile_BQ-5045_…_V05_201030.zip	2020-10-30	760 MB	Download (Google Drive)
10 (Go Edition)	BQ_Mobile_BQ-5045_…_V04_200828.zip	2020-08-28	755 MB	Download (Google Drive)

Quick Steps to Flash BQ-5045 Wallet Firmware

Download and install the MediaTek VCOM drivers. Extract your chosen firmware ZIP file (e.g., BQ_Mobile_BQ-5045_..._V05_201030.zip) and the SP Flash Tool.
Launch flash_tool.exe. Click the “Scatter-loading” button and select the MT6739_Android_scatter.txt file from the extracted firmware folder.
Ensure the flashing mode in the dropdown menu is set to “Download Only.”
Power off your phone and remove the battery. Click the green “Download” button in SP Flash Tool, then connect the phone to your PC via USB cable (without the battery).
The flash will start automatically. Once you see the green checkmark pop-up, you can disconnect the phone, re-insert the battery, 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 MediaTek Firmware with SP Flash Tool

❓ Frequently Asked Questions (FAQs)

Q1. My phone is called “Wallet” but the NFC for Google Pay has stopped working. How do I fix it?: This is the most common issue for this model and is almost always a software problem. Flashing the official stock firmware is the most reliable way to fix it, as it reinstalls the NFC controller’s firmware and the necessary system services for contactless payments to function.
Q2. Why does my phone freeze and show “System UI has stopped”?: This error indicates a critical corruption of the Android interface files, often caused by the limited 1GB of RAM being overloaded. A clean firmware flash is the best solution as it replaces all damaged files and restores the system’s stability.
Q3. The 4G LTE signal is very unstable and often drops. Will this help?: Yes. Unstable mobile data is often a modem firmware issue. Reinstalling the stock ROM from this page restores the entire radio partition and baseband drivers, which is a proven fix for software-based signal dropping problems.

🔧 Device Troubleshooting

The phone is not detected by SP Flash Tool: The removable battery on this model simplifies this. Ensure the VCOM drivers are installed, click “Download” in SP Flash Tool, remove the battery from the phone, and then connect the phone to the PC without the battery inside. This is the most reliable connection method for this chipset.
After flashing, the phone is stuck on the BQ logo (bootloop): The first boot can be slow. If it’s still stuck after 15 minutes, you must boot into recovery mode (Power + Volume Up), and perform a “Wipe data/factory reset” to clear any old data conflicts.
I forgot my Google account and am stuck after a reset (FRP Lock): Flashing this firmware will completely wipe the phone, which includes removing the Factory Reset Protection (FRP) lock. After the flash, you will be able to set up the device with a new Google account.