Q1. Why should I downgrade to Android 6.0.1 from the official Android 7.1.1 update?

Many users found that the official update to Nougat caused significant battery drain and reduced camera performance. This Android 6.0.1 firmware is widely considered by the user community to be the most stable and power-efficient version for the Aquaris U.

Q2. My Wi-Fi connection is very unstable and keeps dropping. Can this be fixed?

Yes, this is a common software complaint. Reinstalling the official firmware restores the Wi-Fi drivers and modem files to their original, stable state, which often fixes bugs that cause random disconnections.

Q3. The camera on my phone seems to take worse photos after I updated it. Will this help?

Yes. Reverting to this original Marshmallow firmware will also restore the original, highly optimized camera software and image processing algorithms. Many users found this version's camera performance to be superior to that of the later Nougat update.

BQ Aquaris U Firmware (Stock ROM) | Downgrade to Android 6.0.1

The BQ Aquaris U is a well-rounded mid-range smartphone from 2016, featuring a 5-inch HD display, the efficient Qualcomm Snapdragon 430 chipset, and a large battery. The device was launched with a highly stable version of Android 6.0.1 Marshmallow and later received an official update to Android 7.1.1 Nougat. However, a large number of users found the Nougat update to be a downgrade in user experience, reporting significant increases in battery drain, unstable Wi-Fi, and a noticeable decline in camera quality. For this reason, many users seek to **downgrade back to this official Android 6.0.1 firmware** to restore the phone’s original stability and performance.

⚠️ CRUCIAL WARNING: Advanced Flashing and Downgrade Risk
This firmware is primarily used to **downgrade** from the problematic Android 7.1.1 Nougat update. Downgrading can be risky and may fail if your device’s bootloader has been updated by the newer OS. The process uses the advanced Fastboot method, requires an unlocked bootloader, and will completely erase all your personal 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 U
Chipset: Qualcomm Snapdragon 430 (MSM8937)
Display: 5.0″ HD IPS (1280×720)
Operating System: Android 6.0.1 Marshmallow
RAM: 2GB
Storage: 16GB
Battery: 3080 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 U Stock ROM / Firmware

OS Version	Build Number	Chipset	Download Link
Android 6.0.1 Marshmallow	1.3.0	Qualcomm Snapdragon 430	Download (MediaFire)

Quick Steps to Flash BQ Aquaris U Firmware

Download and install the Qualcomm drivers. Download and extract the ADB/Fastboot Platform Tools and the firmware ZIP file (BQ_Aquaris_U_..._20161017.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. Why should I downgrade to Android 6.0.1 from the official Android 7.1.1 update?: Many users found that the official update to Nougat caused significant battery drain and reduced camera performance. This Android 6.0.1 firmware is widely considered by the user community to be the most stable and power-efficient version for the Aquaris U.
Q2. My Wi-Fi connection is very unstable and keeps dropping. Can this be fixed?: Yes, this is a common software complaint. Reinstalling the official firmware restores the Wi-Fi drivers and modem files to their original, stable state, which often fixes bugs that cause random disconnections.
Q3. The camera on my phone seems to take worse photos after I updated it. Will this help?: Yes. Reverting to this original Marshmallow firmware will also restore the original, highly optimized camera software and image processing algorithms. Many users found this version’s camera performance to be superior to that of the later Nougat update.

🔧 Device Troubleshooting

The `flash-all.bat` script fails, especially when downgrading: If the script fails, it may be because the bootloader from a newer Android version is preventing the flash. Ensure your bootloader is unlocked. If it still fails, the downgrade may not be possible on your specific device, which is an inherent risk of the process.
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 can take a very 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.