How to Root Xiaomi Mi Max 3 and Install TWRP Recovery In Xiaomi Phones
Useful Commands:
adb reboot bootloader
fastboot flash recovery twrp.img
fastboot reboot
Useful Links:
TWRP for Xiaomi Mi Max 3
Xiaomi Mi Max 3
Latest Magisk manager.Zip, APK
https://github.com/topjohnwu/Magisk/releases
ADB Fastboot toolkit
SDK Platform Tools release notes | Android Developers
Mi Max 3 Custom ROMs
Max3 - Google Drive