The Xiaomi Mi Mix 3 5G (codename andromeda) launched in 2019 as one of the brand’s earliest 5G smartphones. Over time, many users have needed to flash firmware to fix bootloops, restore stock MIUI, or try out Xiaomi.eu for improved performance. This page provides official fastboot ROMs for China, Global, and EEA regions, along with the popular Xiaomi.eu custom ROM.
Important: Always double-check your device codename (andromeda) before flashing. Cross-flashing the wrong ROM may lead to a hard brick. The Mi Mix 3 5G does not have as many recovery options as newer models, so proceed carefully.
Quick Device Specs
- Device: Xiaomi Mi Mix 3 5G (andromeda)
- Release year: 2019
- Chipset: Qualcomm Snapdragon 855 + X50 5G modem
- Display: 6.39″ AMOLED, FHD+, 93.4% screen-to-body ratio (slider design)
- Battery: 3800 mAh, 18W fast charging, QC4+ support
- Original MIUI: Android 9.0 (Pie), MIUI 10
Required Downloads
| File / Tool | Download Link |
|---|---|
| Xiaomi Mi Flash Tool | Download Latest Version |
| Xiaomi USB Drivers | Included with Mi Flash Tool |
| Bootloader Unlock Tool | Official Mi Unlock Page |
| Region | Build | Android | Release Date | Download | Codename |
|---|---|---|---|---|---|
| China (CN) | V10.3.17.0.PEMCNXM | 9.0 | 2019-08-01 | Download | andromeda |
| Global | V12.0.4.0.PEMMIXM | 9.0 | 2021-03-24 | Download | andromeda |
| EEA (Europe) | V12.0.7.0.PEMEUXM | 9.0 | 2021-05-26 | Download | andromeda |
| Xiaomi.eu (Custom) | V12.0.4.0.PEMMIXM (Based) | 9.0 | — | Download | andromeda |
How to Flash: A Safe Pre-Flight Checklist
This is a quick checklist for this device. For a complete tutorial on installing drivers, unlocking the bootloader, and troubleshooting, please read our master guide:
Read Our Ultimate Guide to Mi Flash Tool
- Enter Fastboot Mode: Power off your Xiaomi Mi Mix 3 5G. Then, hold the Volume Down + Power buttons until the Fastboot logo appears.
- Load Firmware: In Mi Flash Tool, click “select” and choose the extracted firmware folder (the folder containing the ‘images’ directory).
- Select Flash Option: At the bottom of the tool, select “clean all”. This performs a full wipe and is the safest option for a clean installation. Avoid “clean all and lock” unless you are certain you want to relock the bootloader.
FAQs (device-specific)
Q1. Can I flash Mi Mix 3 (non-5G) firmware on Mi Mix 3 5G (andromeda)?
No — the Mi Mix 3 (perseus) and Mi Mix 3 5G (andromeda) are different devices. Flashing the wrong ROM will brick your phone.
Q2. Why is Android 9.0 the latest version?
The Mi Mix 3 5G officially launched with Android 9.0 and did not receive major Android version upgrades beyond MIUI 12. Users who want newer Android bases usually install Xiaomi.eu or custom ROMs like LineageOS.
Q3. Can I relock the bootloader after flashing Xiaomi.eu?
No. Relocking on Xiaomi.eu or a different regional ROM may hard brick your device. Only relock on stock ROMs for your exact region (CN, Global, or EEA).
Q4. My device shows “Critical Partition error” in Mi Flash — what should I do?
This happens if you try downgrading or cross-flashing. Always use the correct codename (andromeda) and avoid firmware with a lower rollback index (ARB).
Troubleshooting
- Drivers: Install Qualcomm QDLoader 9008 + ADB/Fastboot drivers before flashing.
- Fastboot mode: Hold Volume Down + Power until Fastboot logo appears.
- Common Mi Flash errors:
- “error: not catch checkpoint” → wrong folder selected (choose the one with
/images). - “Anti rollback error” → you’re trying to downgrade below ARB level.
- “error: not catch checkpoint” → wrong folder selected (choose the one with
- EDL recovery: The Mi Mix 3 5G can enter EDL via test-points if hard-bricked. This requires technical skill and should be a last resort.
