We’ve got some great news for those of you who’ve used the HTC method to root your HTC Evo 3D and you have HBOOT 1.50 with S-ON, you can actually flash a new kernel along with your ROM simply by loading ClockworkMod Recovery from fastboot, which allows you to write to the boot partition.
First, put your phone in fastboot mode by turning off “Fastboot” under Settings->Power. Then power off your phone and reboot into recovery by holding down Volume down and Power button together. Once in bootloader, hit Power button once more to enter fastboot mode and connect a USB cable from phone to your computer.
To do this, you can use the same rootevo3dnew folder you used to root your phone. (You can download rootevo3dnew.zip here again if you delete it.)
Go into the directory where you’ve unzipped rootevo3dnew.zip by typing:
for Windows and Linux or Mac should be something like:
fastboot boot cwm-22.214.171.124-shooter.img
for Windows and for Mac:
./fastboot-mac boot cwm-126.96.36.199-shooter.img
and for Linux:
./fastboot-linux boot cwm-188.8.131.52-shooter.img
Your phone will reboot into ClockworkMod Recovery, you can flash any kernel/ROM and they will be flashed correctly now. Yes, this means you can flash 2.3.3 ROMs too!
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