MI Max 2 soft-bricked
Your phone boots into recovery because of a short circuit in the Volume Button.  


From TWRP Recovery, get a backup of boot partition and
copy the boot.emmc.win file to PC via MTP-USB
tap "Reboot" and "Bootloader" to enter fastboot mode
boot your phone from fastboot with  

fastboot boot "C:\Users\&lt;profil&gt;\Desktop\boot.emmc.win"

you must repeat the last step each time you want to boot into system