Dual booting can be a lot of fun. Having one custom ROM to do with as you please is great. But when you have two custom ROMs to do with what you want, the possibilities are even greater. Having multiple configurations allows users to have more versatility in how they set up their ROMs. For instance, a user can set up one ROM with just emails for work and have the other ROM available with games and social media for play. Now, the CDMA and GSM HTC EVO 3D can dual boot.
The process is similar to performing the task on other devices. It requires downloading Boot Manager and setting everything up from there. The guide was posted by XDA Senior Member gav-collins1983. In essence, users download the ROMs they want and install their primary ROM through their custom recovery as usual. Then, using the application, they install the second one. Of course, it is highly recommended to make Nandroid backups all along the process in case something goes wrong.
And since the instructions are fairly generic, not only are they compatible with both the GSM and CDMA variants of the EVO 3D, but they should also work on many other devices. However, if you’re on an unsupported device, make sure you have a good backup to restore from in case things get sticky.