1. First, we need unlock bootloader.
2. Insert to phone memory card.
2. Turn on HTC Desire 601 phone in fastboot mode and connect to usb cable.
3. Open command prompt with admin rights
4. Go to c:\Adb directory
5. Use command fastboot flash recovery htc_recovery.img and press enter key.
6. Disconnect from usb cable.
7. Now select in HTC Desire 601 by volume buttons hboot and press power button to confirm
8. Select recovery and confirm by press power button
9. The phone will turn on in the custom recovery that we write before.
10. Select Install, then Storage select microSD card.
11. Next select file SuperSU-v2.82-201705271822.zip that you copied before to memory card.
12. Swipe from left to right to confirm process. Wait until process end with success.
13. Press Reboot System button to reboot the phone and end root process.
14. Swipe from left to right to confirm process.
Congratulations. All goes well, your HTC Desire 601 is rooted now.