An XDA user has released an all in one tool that can Unlock, Root, S Off, TWRP, CWM, Lock and even Super-CID your HTC One Max – it is indeed the super tool. Just keep in mind that rooting void your phone’s warranty. The super tool works with all editions of HTC Max (including sprint and verizon variants).
Download the file from here and connect your HTC One Max to the computer. Then carefully the on screen instructions to Unlock, Root, S Off, TWRP, CWM, Lock or Super-CID your phone.