On your device the bootloader must be unlocked!!!
Flashing a custom recovery is always risky. Make a backup of your current recovery first!
I will keep this thread updated once the new releases arrive.
Enter the fastboot mode and execute the following command:
fastboot flash recovery twrp-3.2.3-0-duma.img
TeamWin Recovery Project, @yattodettaman
Current Stable Version: 3.2.3-0
Stable Release Date: 2018-11-15
Last Updated: 2018-11-15