Q1. The GPS on my Aquaris M4.5 is very slow and inaccurate. Will this firmware fix it?

This is the most common complaint for this model. Flashing the stock ROM is a highly recommended solution as it resets the phone’s GPS configuration files (gps.conf) and clears old AGPS data, which can significantly improve location accuracy and the speed of getting a satellite lock.

Q2. My phone gets very hot and the battery dies quickly. What can I do?

A clean firmware flash is an effective way to address software-related overheating and battery drain. It removes rogue background processes and restores the original power management settings. After flashing, consider calibrating the battery by draining it to 0% and then charging it to 100% uninterrupted.

Q3. I’m getting a “PMT changed for the ROM” error in SP Flash Tool. What should I do?

This error means the partition layout is mismatched, often from a failed update attempt. To fix this, change the flashing mode in SP Flash Tool from “Download Only” to “Firmware Upgrade” and try the process again.

BQ Aquaris M4.5 Stock ROM (Firmware) | Fix GPS & Battery Issues

The BQ Aquaris M4.5 is a compact 4G LTE smartphone from 2015, known for its bright qHD display and a clean, near-stock Android 5.1 Lollipop experience. It was a popular budget-friendly device, but over its lifespan, many users have encountered persistent software issues that degrade the user experience. The most widely reported problems include a highly inaccurate and slow GPS, significant overheating during normal use, and poor battery life. For users looking to resolve these frustrating bugs or restore a device from a bootloop, performing a clean flash of the official stock firmware is the most reliable solution.

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 Aquaris M4.5
Chipset: MediaTek MT6735M
Display: 4.5″ qHD IPS (960×540)
Operating System: Android 5.1 Lollipop
RAM: 1GB / 2GB
Storage: 16GB
Battery: 2470 mAh

🛠 Required Tools & Downloads

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

⬇️ BQ Aquaris M4.5 Stock ROM / Firmware

Android Version	Filename	Release Date	Size	Download Link
5.1 Lollipop	BQ_Aquaris_M4.5_…_20150907.zip	2015-09-07	885 MB	Download (MediaFire)

Quick Steps to Flash BQ Aquaris M4.5 Firmware

Download and install the MediaTek VCOM drivers. Extract the firmware ZIP file (BQ_Aquaris_M4.5_..._20150907.zip) and the SP Flash Tool on your PC.
Launch flash_tool.exe. Click the “Scatter-loading” button and select the MT6735M_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 completely. Click the green “Download” button in SP Flash Tool, then immediately connect the powered-off phone to your PC via USB cable.
The flash will start automatically. Once you see the green checkmark pop-up, you can disconnect the 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 MediaTek Firmware with SP Flash Tool

❓ Frequently Asked Questions (FAQs)

Q1. The GPS on my Aquaris M4.5 is very slow and inaccurate. Will this firmware fix it?: This is the most common complaint for this model. Flashing the stock ROM is a highly recommended solution as it resets the phone’s GPS configuration files (gps.conf) and clears old AGPS data, which can significantly improve location accuracy and the speed of getting a satellite lock.
Q2. My phone gets very hot and the battery dies quickly. What can I do?: A clean firmware flash is an effective way to address software-related overheating and battery drain. It removes rogue background processes and restores the original power management settings. After flashing, consider calibrating the battery by draining it to 0% and then charging it to 100% uninterrupted.
Q3. I’m getting a “PMT changed for the ROM” error in SP Flash Tool. What should I do?: This error means the partition layout is mismatched, often from a failed update attempt. To fix this, change the flashing mode in SP Flash Tool from “Download Only” to “Firmware Upgrade” and try the process again.

🔧 Device Troubleshooting

SP Flash Tool shows a BROM ERROR or the phone is not detected: This is a driver issue. Ensure the MediaTek VCOM drivers are correctly installed (you may need to disable Windows Driver Signature Enforcement). Use a good quality USB cable and a main USB port on your PC. Make sure the phone is completely powered off before connecting it.
The phone is stuck in a bootloop after a successful flash: The first boot can be slow. If it’s still stuck after 15 minutes, you need to clear old data. Boot into recovery mode (Power + Volume Up), select “Wipe data/factory reset,” and then reboot.
The screen has a yellowish tint: Some users noted a warm color calibration on this device’s screen. A firmware flash will restore the default color profile. You can also adjust the colors further using the “MiraVision” display settings found under the “Display” menu in your phone’s settings.