Download Xiaomi Mi Mix 3 Firmware (perseus): Fix Performance Lag & Camera Issues

This guide provides the complete firmware collection for the Xiaomi Mi Mix 3 (perseus). If you’re experiencing performance lag, camera issues, or a bricked device, our verified download links and detailed flashing instructions will help you restore your phone’s functionality. The Mi Mix 3, featuring a Snapdragon 845 chipset, a 6.39-inch AMOLED display, and a sliding camera mechanism, is a premium device, but software glitches can affect its performance. Follow this guide to resolve these issues and optimize your device.

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⚠️ 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 Mix 3 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 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.

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Understanding the Firmware: Types and Regions

Selecting the correct firmware is crucial to avoid bricking your Mi Mix 3. Here’s a breakdown of the available options:

• Fastboot ROM (.tgz): A full factory image for Mi Flash Tool, ideal for unbricking or reverting to stock MIUI.
• Region Codes:
  • CNXM: China version, optimized for local networks but may lack Google Play services.
  • MIXM: Global version with Google services and multi-language support.

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Official Firmware Downloads for Mi Mix 3 (perseus)

These firmware files are sourced from Xiaomi’s official servers for reliability and security. Choose the latest version for your region to ensure optimal performance.

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TWRP Recovery for Mi Mix 3

To flash custom ROMs or perform advanced tasks, install the TWRP custom recovery specific to the Mi Mix 3.

• TWRP Recovery: TWRP-3.3.2B-0306-XIAOMI_MIX3-CN-wzsx150 – Use this to flash custom ROMs or perform advanced recovery tasks.

How to Install TWRP:

1. Download the TWRP .zip file, extract it using 7-Zip, and locate the recovery.img file.
2. Boot your Mi Mix 3 into Fastboot mode (Volume Down + Power).
3. Connect to your PC and open a command prompt.
4. Flash TWRP by running: fastboot flash recovery recovery.img.
5. Boot into recovery: fastboot boot recovery.img.

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Recommended Custom ROMs

For users seeking a bloat-free experience or newer Android versions, custom ROMs can enhance the Mi Mix 3’s performance with its Snapdragon 845 chipset. While no Xiaomi.eu ROM link was provided, you can check trusted sources for compatible versions.

• Xiaomi.eu ROM: Visit Xiaomi.eu Community for the latest Mi Mix 3 (perseus) ROM, offering a lightweight, optimized MIUI experience with Google services.
• LineageOS: Check LineageOS for potential support for perseus, providing a clean Android experience (availability may be limited).

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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)

1. Unzip the Firmware: Extract the .tgz file using 7-Zip to obtain a folder with an “images” subfolder and flash scripts.
2. Launch Mi Flash Tool: Open the Mi Flash Tool with administrator privileges on your Windows PC.
3. Enter Fastboot Mode: Power off your Mi Mix 3, then press and hold Volume Down + Power until the Fastboot logo appears.
4. Connect to PC: Plug your phone into your PC using the USB cable.
5. Load Firmware: In Mi Flash Tool, click “select” and choose the extracted firmware folder. Click “refresh” to detect your device.
6. 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.
7. 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 Mix 3, try reinstalling the Xiaomi USB Drivers or switching to a USB 2.0 port for better connectivity.

Method 2: The Recovery Method (Custom ROMs)

1. Install TWRP: Ensure TWRP is installed using the provided TWRP image.
2. Transfer ROM: Copy the .zip ROM file (e.g., Xiaomi.eu or LineageOS) to your phone’s internal storage or an SD card.
3. Boot into Recovery: Power off your phone, then press Volume Up + Power until the TWRP logo appears.
4. Wipe Data: In TWRP, go to “Wipe” > “Advanced Wipe” and select Dalvik/ART Cache, Cache, and Data. Swipe to confirm.
5. Install ROM: Return to the main menu, tap “Install,” select the .zip file, and swipe to flash.
6. Reboot: Reboot to system after installation completes.

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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.

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Device-Specific Q&A for the Mi Mix 3

• Q1: Why does my Mi Mix 3 experience performance lag? A: Performance lag can result from bloatware or intensive apps taxing the Snapdragon 845. Flashing the latest China ROM (V12.5.1.0) or a custom ROM like Xiaomi.eu can improve responsiveness.
• Q2: How can I fix camera issues on my Mi Mix 3? A: Camera issues, such as focus problems or crashes with the sliding mechanism, may stem from software bugs. Flashing a clean stock ROM or a custom ROM like Xiaomi.eu can stabilize camera performance.
• Q3: Will the Mi Mix 3 receive Android 11 or newer? A: The Mi Mix 3 is officially capped at Android 10 with MIUI 12.5. To experience Android 11 or later, you’ll need a custom ROM like LineageOS (if supported for perseus).