Xiaomi Mi MIX 3 5G is now getting the MIUI 12 update on the devices running the EU version. The Update is stable and can be used as a daily driver. The update brings the MIUI 12 baked over Android 9.0. It comes with the version V18.104.22.168.PEMEUXM.
If you want to Upgrade your MIUI then Use this Method. Make sure to Download the OTA package only, Fastboot ROM will not work with Updater.
Step 1: Unlock the Recovery options to manually install the Update. Open the Updater app and tap on the MIUI logo 7-8 times.
Step 2: Download the OTA package given above, and Place it in /downloaded_rom folder of Internal Storage of your Device
Step 3: Launch the Updater app and Click on three dots on the right corner, click on “Choose Update Package”
Step 4: Select the file which you placed in /downloaded_rom. The installation will begin and the device will automatically boot into new MIUI.
This Method needs an Unlocked Bootloader. If your Device is locked then go here and Unlock it.
Download the MI Flash tool from here and install it.
Download the Fastboot ROM given above.
Step 1: Decompress the Downloaded ROM file
Step 2: Boot the Poco M2 Pro into Fastboot mode by pressing Volume down + Power Button at the same time and Connect it to PC via USB Cable
Step 3: Open the Mi flash tool and in the Address bar, Paste the path of Decompressed ROM file. You can copy the Path by going into the folder and click on the Top bar.
Step 4: After Pasting the Path of decompressed ROM file, Click on “Refresh” button and After that click on “Flash” Button