Please note: this will not work on the RAIDER / Holiday -- only the HTC Vivid for ATT.
The reason is that this requires a HBOOT update, which is specific to the phone, and is signed per carrier.
Copy VIVID_ICS_OTA_ROOTED_CWM.zip to your external SD card
From CWM, flash the VIVID_ICS_OTA_ROOTED_CWM.zip
Put the PH39IMG.zip on your SD card, then reboot to fastboot
Re-lock your bootloader with fastboot, then reboot back into HBOOT
Flash the PH39IMG.zip from HBOOT
Remove PH39IMG.zip from SD card (or remove the SD card so that you can enter fastboot)
Enter fastboot again, and re-unlock bootloader
To get CWM re-installed you can either: a) fastboot flash recovery again OR b) Head to my thread and download the update PH39IMG clockwork installer, put that on your external SD, and boot to HBOOT then install it.
Going back to stock?
Right now, going back to stock Gingerbread or even ICS shouldn't be that hard.
There are two methods:
Restoring to Gingerbread
This can be accomplished by flashing a special PH39IMG.zip
It will restore system, boot, and recovery all back to factory shipping stock.
HBOOT will not be downgraded (not possible).
Restoring to ICS
This can also be accomplished, but it will be a two-step process.
First, you would use CWM to install a (soon to be created) update.zip that would install an unrooted stock ICS rom.
Then you will install a PH39IMG.zip that will remove clockwork and flash boot back to stock also.
EDIT: Updated a 10th time-- this time to allow for ease of installation for people who have no external SD reader
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