Download Xiaomi Mi 4s Firmware (aqua): Fix Bootloop, Lag & Software Issues
This comprehensive guide provides direct download links for the stock firmware flash files and step-by-step instructions to restore your Xiaomi Mi 4s (aqua). Whether you need to reset your phone, fix bootloop issues, bypass password locks, resolve device freezing, or address other software problems, this guide has you covered. The Mi 4s, featuring a Snapdragon 808 chipset, a 5.0-inch FHD display, and a 3260mAh battery, is a mid-range device from 2016 known for its compact design and solid performance. Note: This article is for the aqua codename (Mi 4s), not to be confused with other Xiaomi models like Mi 4 (aries), Mi 4c (libra), or Mi 5 (gemini).
⚠️ Essential Pre-Flash Checklist
Flashing can lead to errors if not done correctly. Complete this checklist to ensure a smooth process. All data will be wiped, so a backup is critical.
- ✅ Full Data Backup: Save photos, contacts, and files to Mi Cloud, Google Drive, or a PC to prevent data loss.
- ✅ Charged Battery: Ensure your Mi 4s has at least 60% battery to avoid interruptions during flashing.
- ✅ Windows PC: The Mi Flash Tool requires a Windows operating system.
- ✅ Original USB Cable: Use a high-quality USB-C cable for a stable connection to your PC.
- ✅ Unlocked Bootloader: Flashing requires an unlocked bootloader. Use the official Mi Unlock Tool (expect a 7-15 day waiting period).
- ✅ Required Software: Install the latest Mi Flash Tool and Xiaomi USB Drivers.
Understanding the Firmware: Types and Regions
Selecting the correct firmware is crucial to avoid bricking your Mi 4s (aqua). The aqua codename is specific to the Mi 4s with the Snapdragon 808 processor, distinct from Mi 4 (aries, Snapdragon 801) or Mi 4c (libra, Snapdragon 808).
- Fastboot ROM (.tgz): A full factory image for Mi Flash Tool, ideal for unbricking or reverting to stock MIUI.
- Recovery ROM (.zip): Used with custom recoveries like TWRP for installing custom ROMs like Xiaomi.eu.
- Region Codes:
- CNFI: China version, optimized for local networks but may lack Google Play services.
- EUXM: Xiaomi.eu version, a debloated MIUI ROM with Google services and multi-language support. Note: No official Global ROM is available for Mi 4s.
Official Firmware Downloads for Mi 4s (aqua)
These firmware files are sourced from Xiaomi’s official servers or trusted repositories for reliability and security. Ensure you download ROMs for the aqua codename to avoid compatibility issues.
| Region | MIUI Version | Android | Release Date | Download Link |
|---|---|---|---|---|
| China (CNFI) | V10.1.1.0.NAJCNFI | 7.0 | 2018-10-19 | Fastboot ROM |
| EU (EUXM) | V10.1.1.0.NAJCNFI | 7.0 | Unknown | Recovery ROM |
Note: No official Global ROM is available for the Mi 4s (aqua). The Xiaomi.eu ROM is recommended for users needing Google services and multi-language support.
TWRP Recovery for Mi 4s (aqua)
To flash custom ROMs or recovery ROMs via TWRP, install the TWRP custom recovery specific to the Mi 4s (aqua).
- TWRP Recovery: TWRP-3.1.0-0-aqua – A reliable TWRP version for aqua. For updates, check TWRP’s official site or XDA Forums, as aqua has limited community support due to its less common Snapdragon 808 chipset.
How to Install TWRP:
- Download the TWRP .img file and rename it to
recovery.img. - Boot your Mi 4s into Fastboot mode (Volume Down + Power).
- Connect to your PC and open a command prompt.
- Flash TWRP by running:
fastboot flash recovery recovery.img. - Boot into recovery:
fastboot boot recovery.img.
Warning: Do not use a TWRP image for other devices (e.g., aries or libra), as it will brick your aqua device. Verify that the TWRP version is aqua-specific.
Recommended Custom ROMs
Custom ROM support for the Mi 4s (aqua) is limited due to its Snapdragon 808 chipset, which is less common than newer Qualcomm processors, reducing community development. The Xiaomi.eu ROM is the primary option for a refined MIUI experience.
- Xiaomi.eu ROM: V10.1.1.0.NAJCNFI Based on Android 7.0 – Offers a lightweight, optimized MIUI experience with Google services.
- LineageOS: Check LineageOS or XDA Forums for unofficial builds like LineageOS 14.1 (Android 7.1) or 15.1 (Android 8.1). Support is limited, and features like the camera may not work fully due to the Snapdragon 808.
How to Flash: Step-by-Step Instructions
Choose the flashing method based on your firmware type: Fastboot for official .tgz files or Recovery for custom .zip files.
Method 1: The Fastboot Method (Official Stock ROMs)
- Unzip the Firmware: Extract the .tgz file using 7-Zip to obtain a folder with an “images” subfolder and flash scripts.
- Launch Mi Flash Tool: Open the Mi Flash Tool with administrator privileges on your Windows PC.
- Enter Fastboot Mode: Power off your Mi 4s, then press and hold Volume Down + Power until the Fastboot logo appears.
- Connect to PC: Plug your phone into your PC using a USB-C cable.
- Load Firmware: In Mi Flash Tool, click “select” and choose the extracted firmware folder. Click “refresh” to detect your device.
- Choose Flash Option: Select “clean all” for a complete reset (recommended for stability). Avoid “clean all and lock” unless you’re certain of the ROM’s region compatibility.
- Start Flashing: Click “flash” and wait 5-10 minutes. Do not disconnect the phone.
Troubleshooting Tip: If Mi Flash Tool fails to detect your Mi 4s, try reinstalling the Xiaomi USB Drivers or switching to a USB 2.0 port for better connectivity.
Method 2: The Recovery Method (Custom ROMs)
- Install TWRP: Ensure TWRP is installed using the provided TWRP-3.1.0-0-aqua image. Check XDA for newer versions if needed.
- Transfer ROM: Copy the .zip ROM file (e.g., Xiaomi.eu) to your phone’s internal storage or an SD card.
- Boot into Recovery: Power off your phone, then press Volume Up + Power until the TWRP logo appears.
- Wipe Data: In TWRP, go to “Wipe” > “Advanced Wipe” and select Dalvik/ART Cache, Cache, and Data. Swipe to confirm.
- Install ROM: Return to the main menu, tap “Install,” select the .zip file, and swipe to flash.
- Reboot: Reboot to system after installation completes.
After the Flash: First Boot and Setup
The first boot after flashing may take 10-15 minutes as the system initializes. Don’t interrupt if it seems stuck on the Mi logo. Once booted, follow the setup wizard and restore your data from your backup.
Device-Specific Q&A for the Mi 4s (aqua)
- Q1: Why does my Mi 4s experience system lag? A: System lag can result from bloatware or heavy apps taxing the Snapdragon 808. Flashing the latest China ROM (V10.1.1.0) or the Xiaomi.eu ROM can improve responsiveness.
- Q2: How can I fix battery drain on my Mi 4s? A: Battery drain may stem from background processes or outdated firmware on the 3260mAh battery. Flashing a clean stock ROM or the debloated Xiaomi.eu ROM can optimize power efficiency.
- Q3: Will the Mi 4s receive Android 8 or newer? A: The aqua variant is officially capped at Android 7.0 with MIUI 10. Unofficial builds like LineageOS 15.1 (Android 8.1) may be available on XDA, but support is limited due to the Snapdragon 808, with potential issues in features like the camera.
- Q4: I flashed a ROM for aries or libra on my aqua device and it’s bricked. What do I do? A: If your device is in EDL mode (Qualcomm HS-USB QDLoader 9008), use Mi Flash Tool with the correct aqua Fastboot ROM (V10.1.1.0.NAJCNFI). Select “clean all” to restore the device. Seek help on XDA Forums if issues persist.
