[HTC Rezound] feralicious:
Here's a post of directions I made for someone else recently. Hope it helps.

Also, if you want to get back on Ineffabilis you can either restore a nand or flash it again without issue, then if you want to use the dsb kernel you will need to either 1) edit the android-info.txt file inside the dsb zip file or 2) flash it up to the point where it wants to "update", don't update, go to fastboot and copy out the boot.img from the dsb zip into your sdk folder and flash it from there. If you want to use Ineffabilis and the new stock kernel you'll need to flash the new kernel modules from here:

http://xdaforums.com/showthread.php?t=1467793 since Ineffabilis has the old ones. *Unless they've updated the ROM, I haven't checked the last couple days.

fastboot flash boot boot.img

You'll then have to delete the PHzip file from your sd card.

Now back to getting the OTA update...

1) get the sdk working on your computer

2) On your phone, do a battery pull, then boot it into fastboot and then connect it to your computer.

3) Type the following at your computer's cmd prompt:

fastboot getvar all

and find out what mainver you are on.

* If you are on a mainver that starts with 3.x then you cannot run the RUUs. If your mainver starts with 1.x or 2.x then continue onto step 4.

4) Relock your phone by typing the following:

fastboot oem lock

5) Download the RUU for your mainver to your computer. Use the file from here that corresponds to your mainver:

http://www.filefactory.com/f/c2e320ee1d5c7886/

This is an exe file so just run it on your pc with your phone attached. I know you need to be locked, I think you need HTC Sync installed, so if it's not working search for those answers, it will work, others have done it. Now you are back to stock.

5) Unlock your phone again using the same unlock bin file you got before by putting it in the same folder you are now using for sdk. Type the following command:

fastboot flash unlocktoken Unlock_code.bin

If you don't have it obtain a new one by following the same steps you did before to get it originally. Here is a guide for that:

http://xdaforums.com/showpost.php?p=20780879&postcount=1

Now you should be stock and unlocked.

6) Flash Amon Ra in fastboot. Get the lateset version, 3.13. here:

http://www.mediafire.com/?chpoxzb8bl4nn2b

Type the following command to flash it:

fastboot flash recovery recovery-ra-vigor-3.13-gnm.img

Now you should have Amon Ra on your phone.

7) Root your phone by installing su using Amon Ra. Go to the developer menu and find the option in there.

Now you should be stock, unlocked and rooted.

8) MAKE A NANDROID BACK UP NOW AND LABEL IT.

9) Flash a new ROM.

*** If your mainver is 3.x try this thread to see if you can come up with a method to go back to stock. I haven't looked into this since I have not ventured into ICS land as of yet.

http://xdaforums.com/showthread.php?t=1459347

There are also some threads about getting back to stock from ICS I think so here are my search results for "stock ics" in the thread title and you can probably find an answer in there somewhere.

Here's another post I had made with an alternative method in it in case you have any trouble with the RUU:

ATERNATIVE METHOD:

You can also use con247's Stock OTA ROM instead of running the RUU.

http://xdaforums.com/showthread.php?p=21880389

Here are the steps to take to accomplish that:

1) use Amon Ra to flash con's vigorStock OTA ROM. It will do its thing then reboot to hboot. I think it then asks you if you want to update. Don't do it yet.

2) At this point you want to relock. So go into fastboot on the phone. Using adb/fastboot type the following at the cmd prompt:

fastboot oem lock

3) Reboot phone and let it flash the PHzip file. It should reboot completely when it's finished.

4) delete the PHzip file using a file explorer app like ES File Explorer or Root Explorer.

5) get the phone back into fastboot. Unlock again using adb/fastboot. I don't remember the exact command but you can find that in the guide for unlocking.

6) reinstall su using Amon Ra.

Now you should be stock OTA rooted with the new goodies.

Check in Settings > About phone > Software info > More to see that you got all the new stuff.