Q1. My Aquaris E5 4G battery drains very fast after the Marshmallow update. Will this fix it?

Yes, this is the most common complaint for this model. A clean flash of the stock Marshmallow firmware is the best way to solve software-related battery drain, as it removes any conflicting files left over from a previous OS version like Lollipop.

Q2. My phone keeps losing its 4G LTE signal and dropping to 3G. Why?

This is often a modem firmware issue. Reinstalling the official stock ROM restores the entire radio partition and baseband drivers responsible for network connectivity, which is a reliable fix for software-based signal dropping.

Q3. How can I be sure I have the 4G version and not the 3G version?

The simplest way is to check "About Phone" in your settings; the 4G version will be listed. Most importantly, the flashing tools are different. This 4G model uses a Qualcomm chipset and requires Fastboot. The 3G model uses a MediaTek chipset and requires SP Flash Tool. Using the wrong firmware will fail and can brick the device.

BQ Aquaris E5 4G Stock ROM (Firmware) | Fix Battery & Network Issues

The BQ Aquaris E5 4G is the Qualcomm Snapdragon variant of the popular 2015 smartphone, offering 4G LTE connectivity. This guide provides the official stock Android 6.0.1 Marshmallow firmware for this specific model. Many users reported that the over-the-air (OTA) update to Marshmallow introduced several bugs, with the most common complaints being a significant reduction in battery life, unstable 4G network connections, and overheating. For users experiencing these software-related issues, or for those needing to unbrick their device, a clean flash of the official stock firmware is the definitive solution.

⚠️ CRUCIAL WARNING: 4G Qualcomm Version ONLY
This firmware is exclusively for the BQ Aquaris E5 (4G model) with a Qualcomm Snapdragon chipset. It is NOT compatible with the 3G version which uses a MediaTek chipset. Flashing the wrong firmware will brick your device. The process uses the advanced Fastboot method, requires an unlocked bootloader, and will completely erase all your data.

⚠️ Prerequisites: Before You Begin

Click Here for the Essential Pre-Flashing Checklist

Backup Your Data: This process will wipe everything on your phone’s internal storage.
Charge The Battery: Ensure your phone has at least a 60% charge to prevent it from shutting down during the process.
Windows PC & USB Cable: You will need a Windows computer and the phone’s original micro USB cable.
Unlock Bootloader: Your device’s bootloader must be unlocked to flash firmware via Fastboot.

📱 Quick Device Specifications

Device: BQ Aquaris E5 (4G Version)
Chipset: Qualcomm Snapdragon 410 (MSM8916)
Display: 5.0″ HD IPS (1280×720)
Operating System: Android 6.0.1 Marshmallow
RAM: 1GB / 2GB
Storage: 16GB
Battery: 2850 mAh

🛠 Required Tools & Downloads

File / Tool	Download Link
ADB and Fastboot Platform Tools	Download from Google
Qualcomm HS-USB QDLoader Drivers	Download Drivers

⬇️ BQ Aquaris E5 (4G) Stock ROM / Firmware

OS Version	Build Number	Chipset	Download Link
Android 6.0.1 Marshmallow	4.5.0	Qualcomm Snapdragon 410	Download (MediaFire)

Quick Steps to Flash BQ Aquaris E5 (4G) Firmware

Download and install the Qualcomm drivers. Download and extract the ADB/Fastboot Platform Tools and the firmware ZIP file (BQ_Aquaris_E5_4G_..._6.0.1.zip) into the **same folder**.
Power off your phone completely. Reboot it into Fastboot Mode by pressing and holding the Power + Volume Down buttons simultaneously until you see the Fastboot menu.
Connect your phone to your PC via USB cable.
Inside the folder where you extracted the files, find and double-click the `flash-all.bat` script to run it.
A command prompt window will open and automatically begin the flashing process. Do not unplug the phone or close the window.
The script will flash all necessary partitions and the phone will reboot automatically once the process is complete.

❓ Frequently Asked Questions (FAQs)

Q1. My Aquaris E5 4G battery drains very fast after the Marshmallow update. Will this fix it?: Yes, this is the most common complaint for this model. A clean flash of the stock Marshmallow firmware is the best way to solve software-related battery drain, as it removes any conflicting files left over from a previous OS version like Lollipop.
Q2. My phone keeps losing its 4G LTE signal and dropping to 3G. Why?: This is often a modem firmware issue. Reinstalling the official stock ROM restores the entire radio partition and baseband drivers responsible for network connectivity, which is a reliable fix for software-based signal dropping.
Q3. How can I be sure I have the 4G version and not the 3G version?: The simplest way is to check “About Phone” in your settings; the 4G version will be listed. Most importantly, the flashing tools are different. This 4G model uses a Qualcomm chipset and requires Fastboot. The 3G model uses a MediaTek chipset and requires SP Flash Tool. Using the wrong firmware will fail and can brick the device.

🔧 Device Troubleshooting

The `flash-all.bat` script gives an error or closes immediately: This usually means Fastboot is not set up correctly. Ensure the ADB/Fastboot tools and all the extracted firmware `.img` files are in the exact same folder as the script. Also, verify your phone is detected by typing `fastboot devices` in a command prompt.
My phone is not detected in Fastboot mode: This is a driver issue. Ensure you have installed the Qualcomm and ADB drivers correctly. You can check the connection by opening a command prompt in the firmware folder and typing `fastboot devices`. If a serial number appears, you are connected.
After flashing, the phone is stuck on the BQ boot animation: The first boot after a full flash can take a long time (up to 20 minutes). If it’s still stuck, you must perform a factory reset. Boot into recovery mode (Power + Volume Up), then navigate to “Wipe data/factory reset” and confirm.