The Mi Max 3 (codenamed nitrogen) was Xiaomi’s phablet flagship featuring a massive 6.9-inch display, Snapdragon 636 processor, and enormous 5500mAh battery. If your device is experiencing display problems, battery drain issues, performance lag, or software instability, this guide provides the official MIUI fastboot ROMs and custom recovery needed for complete system restoration.

Important Notice: Verify your device codename is nitrogen before flashing. The Mi Max 3 is distinct from previous Max series with its larger display and different chipset. Flashing incorrect firmware will result in a non-functional device.

Quick Device Specifications

Device: Mi Max 3 (nitrogen)
Release Year: 2018
Chipset: Qualcomm Snapdragon 636 (14nm)
Display: 6.9″ IPS LCD, 1080 × 2160 pixels (18:9)
Camera: 12MP + 5MP dual rear, 8MP front camera
Battery: 5500 mAh with Quick Charge 3.0
Original OS: Android 8.1 Oreo, MIUI 9
Special Feature: Giant screen optimized for media consumption and gaming

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 nitrogen
Mi Unlock Tool	Bootloader Unlock

Official Fastboot ROM Collection

Region / Variant	Build Version	Android	Release Date	Download Link
China Stable	V12.5.1.0.QEDCNXM	10.0	2021-06-16	Download
Global Stable	V12.0.1.0.QEDMIXM	10.0	2020-10-13	Download
Russia Stable	V12.0.1.0.QEDRUXM	10.0	2020-10-12	Download
Xiaomi.eu (Custom)	V12.5.1.0.QEDCNXM (Based)	10.0	—	Download

Flashing Guide for Mi Max 3 (nitrogen)

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 downloaded .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 (5-7 minutes)

Method 2: TWRP Recovery (Custom)

Flash TWRP: Fastboot flash recovery twrp.img
Boot to TWRP: Hold Volume Up + Power during boot
Flash ROM: Install custom ROM zip from storage
Wipe Data: Format data for clean installation

Frequently Asked Questions (FAQs)

Q1. Why is my massive 5500mAh battery draining quickly?
The large display is the main power consumer. After flashing, calibrate the battery by charging to 100%, draining completely, then full charge. Also check for background apps draining power.

Q2. Can I upgrade to Android 11 on Mi Max 3?
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.

Q3. Why does the China ROM have newer updates than Global?
Xiaomi typically provides longer support for Chinese market devices. The China variant received MIUI 12.5 based on Android 10, while Global stopped at MIUI 12.

Q4. My display has touch response issues. Can flashing help?
Yes, display touch issues can sometimes be resolved by flashing stock firmware which recalibrates touch drivers. If problem persists, it may be hardware-related.

Device-Specific Troubleshooting

Display Scaling Issues: The 6.9″ display may have scaling problems with some apps. Use MIUI’s display settings to adjust text size and display size.
Battery Calibration: The 5500mAh battery requires proper calibration after flashing for accurate percentage reading.
Performance Optimization: The Snapdragon 636 handles most tasks well. Use Game Turbo for better gaming performance on the large display.
Storage Management: With 64GB/128GB options, use the large storage for media consumption which the device is designed for.