How to upgrade Xiaomi Mi Max 2 to MIUI 12: All ways + problem solving

Do you want to upgrade the Mi Max 2 to MIUI 12?

The Xiaomi Mi Max 2, released in 2017, hasn’t officially received an upgrade to MIUI 12 from the manufacturer.The last stable version for this device is MIUI 11 based on Android 9 Pie. However, enthusiasts have found ways to install the new shell – both through custom firmware and ported versions of MIUI 12. But before you start, it is important to weigh the pros and cons.

On the one hand, MIUI 12 offers modern design, improved animation, new privacy features (such as the Mask System for hiding personal data) and optimized gesture management. On the other hand, the Mi Max 2 with its Snapdragon 625 and 4 GB of RAM can face slowdowns, and informal firmware is devoid of warranty (if it is still valid) and requires unlocking the bootloader, which carries risks.

In this article, we will discuss:

• 🔍 The official restrictions and why Xiaomi has not released MIUI 12 for Mi Max 2
• ⚙️ Preparation of the device for updating (backup, unlock, drivers)
• 📱 3 methods of installation: through TWRP, Fastboot and Alternatives ROM
• ⚠️ Typical Errors and How to Avoid Them (Bootloop, Error 7 in) TWRP)
• ⚡ Optimizing performance after updating

Why Xiaomi hasn’t released MIUI 12 for the Mi Max 2

The reason is because of Xiaomi’s support policy: the company provides updates for devices for 2-3 years from the release date, and the Mi Max 2 was released in May 2017. By 2020, when MIUI 12 was released, support for the model has already ended. Moreover, the MIUI 12 shell requires Android 10 or later, and the latest official version for the Mi Max 2 is Android 9.

Technical limitations also play a role:

• 🔋 Snapdragon 625 processor not optimized for new features MIUI 12 (such as Super Wallpapers or Floating Windows).
• 📉 4GB of RAM may not be enough to run smoothly with new animations.
• 🗃️ EMMC-memory (instead of UFS) slows down reading/write, which is critical for heavy firmware.

However, the development community has ported MIUI 12 to the Mi Max 2 based on Android 10.These firmware lacks some features (e.g., the Game Turbo may run unstable), but gives access to major interface improvements.

Preparing the device for the update: Step-by-step

Before installing MIUI 12, several critical actions must be performed, and skipping any of them can cause the device to "brick" (inoperability).

1. Create a backup copy of:

• 📱 Use the built-in Mi Backup app (Settings) → Additionally. → Backup).
• ☁️ Upload a copy to Mi Cloud or Google Drive.
• 💾 Copy important files (photos, videos) to a PC or external drive.

2. Unlock the loader:

• 🔓 Go to Mi Unlock and get permission (may take up to 72 hours).
• 🖥️ Install Mi Unlock Tool on PC and connect your phone in Fastboot mode (clip Volume Down). + Nutrition).
• ⚠️ Warning: Unlocking will reset all data on the device!

3. Install TWRP Recovery:

• 📥 Download the current version TWRP Mi Max 2 (codename oxygen) from twrp.me.
• 🖱️ In the command line, run fastboot flash recovery. twrp-3.7.0_9-0-oxygen.img fastboot boot twrp-3.7.0_9-0-oxygen.img

Check the battery charge (minimum) 60%)|Download firmware MIUI 12 oxygen|Install drivers ADB/Fastboot|Disable antivirus on PC|Prepare. OTG-cable (in case of bootloop)

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How to install MIUI 12 on Mi Max 2

There are three main methods of firmware, and the choice depends on your experience and goals:

Method 1: Installation via TWRP

1. Download MIUI 12 for oxygen (e.g., xiaomi.eu).
2. Reboot to TWRP (Loudness Up + Power).
3. Select Wipe → Advanced Wipe and tick Dalvik, Cache, Data (don’t touch Internal Storage!).
4. Press Install, select the firmware file and confirm.
5. After installation, run the Wipe Cache and restart.

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If after firmware the phone is stuck on the logo MI, Try to re-enter the TWRP sniff Disabler_Dm-Verity_ForceEncrypt.zip (download 4PDA).

Method 2: Installation via Fastboot

This method is suitable for “clean” installation:

1. Download Fastboot-ROM for Mi Max 2 (for example, from the official website, but modified to MIUI 12).
2. Unpack the archive in a folder with fastboot and adb.
3. Connect your phone in Fastboot mode and launch the script: flash_all.bat

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Fastboot erases all data without recovery, and only use it if you're ready to reset completely.

Typical errors and their solutions

Even if you follow the instructions accurately, you can have problems.

1. Mistake. 7 into TWRP («Failed to mount /data»)

⚠️ Note: This error is related to partition encryption /data. To avoid it, before the firmware, perform in TWRP: Format Data → Type "yes." This will delete all data, but allow you to continue the installation.

2. Bootloop (cyclic reboot)

• 🔄 Try flashing Magisk for root rights (if you need them).
• 🔋 Remove the battery for 10 minutes (if possible) or wait until it is completely discharged.
• 📥 Check out the stable version. MIUI 11, then repeat the update.

3. Loss of IMEI or network

If the signal is missing after the firmware:

1. Set it through TWRP patch IMEI_Repair_Oxygen.zip (look 4PDA).
2. Enter in the engineering menu (##4636##) team: AT +EGMR=1,7,"IMEI_1" AT +EGMR=1,10,"IMEI_2"

Optimizing MIUI 12 for Mi Max 2: How to speed up your work?

MIUI 12 can brake on the Mi Max 2 due to hardware limitations.

1. Turn off unnecessary animations:

• 🎨 Go to Settings. → The phone. → Version. MIUI (Tap 7 times to turn on Developer Mode).
• Return to Settings → Additional → For Developers and Install: Window Animation → Off. Transition Animation → Off. Animation Scale → 0.5x

2. Limit background processes:

• 🔄 In the same Developer menu, find the Process Limit and select Process Maximum 2.
• 🚫 Turn off auto-start for unnecessary apps in Settings → Annexes → Auto-start.

3. Use lightweight versions of applications:

• 📱 Install Facebook Lite, Messenger Lite, Twitter Lite instead of the standard versions.
• 🎵 Replace YouTube with NewPipe (no ads and easier).

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If the phone is getting too hot, try limiting the maximum CPU clock speed through the Kernel Adiutor app (root required).

MIUI 12 alternatives: What firmware can you install?

If MIUI 12 is not working properly, consider other options:

Use the same algorithm as for MIUI 12 (unlock bootloader + TWRP) to install alternative firmware.

• 🔗 XDA Developers
• 🔗 4PDA (Mi Max 2 section)
• 🔗 SourceForge (official mirrors of LineageOS)

FAQ: Answers to Frequent Questions