[HTC EVO 3D] kittykat858:
there have been directions here for quite some time

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http://infectedrom.com/showthread.php/552-How-to-install-a-kernel-AND-rom-on-S-ON-hboot-1.50-phones.

hitchhikers guide to hboot 1.50 and S-ON

so, you unlocked using HTC's unlocker located at HTCDEV.com

some background on this unlock method:

-when you unlock using HTC's unlock method, the boot partition is still read only, and you cant flash to it. (kernels and ramdisks go here - so no 2.3.3 rom will boot, and most 2.3.4 roms will not work correctly)

when you unlocked your bootloader using HTC's method, you should have downloaded a file that contained some program files, mainly fastboot.exe and adb.exe, as well as the device drivers you would have to install to unlock

- you will need these

to get around this problem HTC has created, we will be using the fastboot.exe program to force the ramdisk/kernel onto the phone. anytime you use fastboot to flash a partition, you risk bricking your phone, so please do this at your own risk.

I have walked several people thru this, and no one had any problems, but if something dont go right, or the connection between the pc and the phone gets interrupted, your phone may become bricked.

I am going to assume you know the basics of flashing a rom, and that you have either teamwin or clockwork's recover tool installed on your phone (and you know how to use them). if not please see series #3 below.

SERIES 1 - INSTALL A ROM AND RAMDISK/KERNEL

Step 1 - backup everything on your phone, nandroid backup

step 2 - if you want to flash the ext4 optimizer for /data, read the info and directions here -> http://xdaforums.com/show...postcount=6329

------>everything should be backed up now

Step 3 - flash Virus's superwipe tool.

Step 4 - flash the /data optimizer tool - the download can be found in the post linked in step 2

Step 5 - open the rom you downloaded using winrar, or 7zip, and copy the boot.img file somewhere (the same folder that contains the tools you used to unlock your phone would be a perfect place)

Step 6 - open a command prompt (or terminal window), and goto the window that contains the tools you used to unlock your boot loader

Step 7 - reboot your phone into fastboot (adb reboot bootloader)

Step 8 - from the command prompt enter the following command:

fastboot flash boot boot.img

then press [enter]

Step 9 - once complete, exit fastboot, and boot back into recovery

Step 10 - flash the rom's zip file using recovery

Step 11 - enjoy

SERIES 2 - INSTALL A RAMDISK/KERNEL (ROM ALREADY FLASHED)

*signs of a failed ramdisk flash include broken wifi, 4g, poor performance and just weirdness in general. the updater scripts used to install a rom will not flash ramdisk with S-ON.

Step 1 - open the rom you downloaded using winrar, or 7zip, and copy the boot.img file somewhere (the same folder that contains the tools you used to unlock your phone would be a perfect place)

Step 2 - open a command prompt (or terminal window), and goto the window that contains the tools you used to unlock your boot loader

Step 3 - reboot your phone into fastboot (abd reboot bootloader)

Step 4 - from the command prompt enter the following command:

fastboot flash boot boot.img

then press [enter]

Step 5 - reboot your phone and enjoy (fastboot reboot)

SERIES 3 - INSTALL A RECOVERY TOOL

*you may need to do this before each flash, some phones somehow break recovery after a rom is flashed, and recovery will not launch until re-flashed for some reason (Kathy.. )

Step 1 - download TeamWin's recovery here (IMG format) -> http://dl.dropbox.com/u/24995663/recovery.img

Step 2 - copy this file to the same directory as your fastboot and adb files HTC had you download to unlock your phone.

Step 3 - goto your dos prompt (or terminal if on linux)

Step 4 - change directories to the folder your files are in (recovery.img and fastboot)

Step 5 - flash your recovery using the following command

fastboot flash recovery recovery.img

Step 6 - reboot your phone (fastboot reboot)

*disclaimer - you do this at your own risk. as of yet, the processes listed above work 100% and not 1 failure has been reported. make sure your usb cable is good, and your pc has good power during any fastboot process. most of this comes from a chat i had in the synergy public/general chat room 2 hours prior to it being posted on XDA by others claiming credit. kangers goto hell.