[Xiaomi Mi Max 3 Questions & Answers] opasha:
GUIDE to go from BUGGY VENDOR ROM with UNLOCKED BOOTLOADER to 8.8.9 XIAOMI.EU:

Download 8.8.9 xiaomi.eu from one of these 3 links: 1) https://www.androidfilehost.com/?w=files&flid=280379 2) https://sourceforge.net/projects/xi...s/files/xiaomi.eu/MIUI-WEEKLY-RELEASES/8.8.9/ 3) http://miui.dedyk.gq/8.8.9/xiaomi.eu_multi_MIMAX3_8.8.9_v10-8.1.zip

1) Flash China Beta 8.8.9 with Mi Flash Tool using the option "Clean All" (DO NOT choose 'Clean All and Lock'). Links and instructions below:

a) China Beta 8.8.9: bigota.d.miui.com/8.8.9/nitrogen_images_8.8.9_20180809.0000.00_8.1_cn_7bfe310762.tgz

b) Mi Flash Tool:

1b) download link: https://xiaomiflashtool.com/download/xiaomi-flash-tool-20180528

2b) instructions on how to use: https://xiaomiflashtool.com/tutorial/use-xiaomi-flash-tool

3) Let your China rom boot up, then login to your Mi Account (if you haven't made one yet, make it here: https://global.account.xiaomi.com/pass/register

4) Once logged in, go to Settings>Additional Settings>Developer Options>Turn ON USB Debugging, Install via USB, and USB Debugging (Security Settings).

5) Download Minimal ADB and Fastboot: https://xdaforums.com/showthread.php?t=2317790. Extract it to your desktop so you can use it from there easily and rename the folder to ADB.

6) Download TWRP Recovery: https://eu.dl.twrp.me/nitrogen/twrp-3.2.3-0-nitrogen.img.html. Rename it to recovery.img and place it in your ADB folder.

7) Open cmd (Windows Command Processor/command prompt) within ADB folder or navigate there directly by opening cmd and enter the following steps: cd C:\Users\WhateverYourUsernameIs\Desktop\ADB (this puts you in the ADB folder).

8) Turn your phone off. Boot your phone back into FASTBOOT MODE (press and hold VOLUME DOWN and POWER for 6-8 seconds), then plug it into your computer. In cmd, enter the following:

fastboot format userdata, then flash TWRP using the following commands: fastboot flash recovery recovery.img, then boot to recovery using the following commands: fastboot boot recovery.img

9) Changing file system from ext4 to f2fs is NOT NECESSARY, but I included it in case you run into errors, so skip to the WIPE portion of this section: In TWRP, change your file system from ext4 to f2fs: Wipe > Advanced Wipe > Data > Repair or Change File System > Change File System > F2FS. Then go back (back button at the bottom) and mount all your partitions: Mount>Check All Partions. Then go back, select WIPE>Advanced Wipe> select Data, Dalvik Cache and Internal Storage (System should NOT be wiped).

10): Transfer 8.8.9 xiaomi.eu rom from your pc to phone's internal storage and install in TWRP: INSTALL>Zip>Select 8.8.9 xiaomi.eu rom>Flash it.

11) REBOOT. The phone should boot without issue and your bootloader should stay unlocked.

12) Enable VoLTE: Once everything is set up, go to dialer and enter the following: *#*#86583#*#*

IF YOU WANT ROOT:

1) Download Magisk 17.1 Stable: https://github.com/topjohnwu/Magisk/releases/download/v17.1/Magisk-v17.1.zip

2) Reboot to Recovery : Turn off phone, press and hold VOLUME UP + POWER for 6-8 seconds until you see the phone boot into TWRP. Select INSTALL>Zip>Magisk-v17.1.zip>Flash it and reboot.

Thanks and credit to: [MENTION=7889477]omer919[/MENTION] and [MENTION=6884878]martin.burgas[/MENTION] - I used some of your install ideas to help everyone :highfive:.

If you have any further questions, just ask.