Xiaomi Mi 8 SE (sirius) Firmware Flash File Download [Stock ROM]
The Mi 8 SE (codenamed sirius) was Xiaomi’s compact flagship featuring the first Snapdragon 710 processor, AMOLED display, and premium camera system in a smaller form factor. If your device is experiencing performance issues, camera malfunctions, battery drain, or software instability, this guide provides the official MIUI fastboot ROM and custom recovery needed for complete system restoration.
Important Notice: Verify your device codename is sirius before flashing. The Mi 8 SE was the first phone with Snapdragon 710 and has unique hardware characteristics. Flashing incorrect firmware will result in a non-functional device.
Quick Device Specifications
- Device: Mi 8 SE (sirius)
- Release Year: 2018
- Chipset: Qualcomm Snapdragon 710 (10nm) – First implementation
- Display: 5.88″ AMOLED, 1080 × 2244 pixels (18.7:9)
- Camera: 12MP + 5MP dual rear, 20MP front camera
- Battery: 3120 mAh with 18W fast charging
- RAM: 4GB/6GB LPDDR4X
- Storage: 64GB/128GB UFS 2.1
- Security: Rear fingerprint scanner
- Original OS: Android 8.1 Oreo, MIUI 9
- Special Feature: First smartphone with Snapdragon 710
Essential Downloads & Tools
| File / Tool | Download Link |
|---|---|
| Xiaomi Mi Flash Tool | Download Stable Version |
| Qualcomm USB Drivers | Download Latest Drivers |
| TWRP Recovery | TWRP 3.3.1 for sirius |
| ADB and Fastboot Tools | Official from Google |
| Mi Unlock Tool | Bootloader Unlock |
Official Firmware Collection
| Region / Variant | Build Version | Android | Release Date | Download Link |
|---|---|---|---|---|
| China Stable Fastboot | V12.5.1.0.QEBCNXM | 10.0 | 2021-06-25 | Download |
| Xiaomi.eu Custom ROM | V12.5.1.0.QEBCNXM (Based) | 10.0 | — | Download |
| TWRP Recovery | 3.3.1-1029 | 10.0 | — | Download |
Flashing Guide for Mi 8 SE (sirius)
Method 1: Fastboot Flashing (Official)
- Driver Installation: Install Qualcomm USB drivers on your computer.
- Bootloader Unlock: Unlock bootloader using Mi Unlock Tool (requires waiting period).
- Enter Fastboot Mode: Power off device, then hold Volume Down + Power buttons.
- Flash Process:
- Extract the .tgz file to access firmware folder
- Open Mi Flash Tool and browse to extracted folder
- Select “Clean All” option for fresh installation
- Click “Flash” and wait for completion (4-6 minutes)
- First Boot: Initial boot may take 5-10 minutes as system optimizes.
Method 2: TWRP Recovery (Custom)
- Flash TWRP:
fastboot flash recovery twrp.img - Boot to TWRP: Hold Volume Up + Power during boot
- Install Custom ROM: Flash Xiaomi.eu zip from storage
- Wipe Data: Format data for clean installation
- Flash Additional ZIPs: May need to flash Disable_Dm-Verity if required
Frequently Asked Questions (FAQs)
Q1. Why is my Snapdragon 710 device lagging with performance issues?
The Snapdragon 710 was a flagship processor but may struggle with modern MIUI versions. Flash the stock ROM and use Lite mode or consider custom ROMs for better performance optimization.
Q2. Can I upgrade to Android 11 on Mi 8 SE?
No, Android 10 was the final official Android version. However, there are custom ROMs like Pixel Experience and LineageOS 18.1 (Android 11) available through TWRP if you want newer Android versions.
Q3. Why is the camera quality poor after software updates?
The 12MP + 5MP dual camera system requires specific image processing algorithms. Flash the stock ROM to restore original camera performance and calibration.
Q4. How can I improve battery life on my Mi 8 SE?
The 3120mAh battery is relatively small. After flashing, calibrate the battery, use dark mode with the AMOLED display, and restrict background app activity.
Device-Specific Troubleshooting
- AMOLED Display Issues: The Samsung AMOLED panel may require color recalibration after flashing. Adjust display settings in MIUI.
- Camera Performance: The dual camera system needs proper calibration. Test both cameras and portrait mode after flashing.
- Battery Optimization: The 3120mAh battery benefits from calibration after flashing. Use battery optimization features.
- Thermal Management: The Snapdragon 710 may throttle under load. Ensure proper thermal management through official firmware.
TWRP Installation Guide
- Unlock bootloader officially through Mi Unlock
- Boot to fastboot mode: Power off → Volume Down + Power
- Flash TWRP:
fastboot flash recovery twrp.img - Boot to TWRP:
fastboot boot twrp.img - Format Data: Wipe → Format Data → type “yes”
- Flash custom ROMs and Magisk if needed
Note: Always backup your persist and modem partitions before flashing custom ROMs to avoid sensor and network issues.
Version Information
Android 10: Final official Android version with June 2021 security patch.
MIUI 12.5: Last major MIUI update for this device, based on Android 10.
Security: Final security update from June 2021. Consider custom ROMs for continued security support.
Special Considerations
First Snapdragon 710: This device has unique early-adopter hardware that may require specific firmware optimizations.
Compact Form Factor: The smaller size means tighter thermal constraints – monitor device temperature during heavy usage.
AMOLED Benefits: Use dark mode and always-on display features to maximize battery life from the AMOLED panel.
