Phone [Q] Help with installing CyaongenMod recovery tool

Hey folks,

I'm trying to install a recovery image using fastboot, as per the directions presented here:

http://wiki.cyanogenmod.org/w/Install_CM_for_fireball

When I try flashing the recovery, I get the following error message:

Code:
sudo fastboot flash recovery recovery-clockwork-6.0.4.6-fireball.img 
sending 'recovery' (7784 KB)...
OKAY [  1.117s]
writing 'recovery'...
FAILED (remote: not allowed)
finished. total time: 1.149s
I was able to obtain S-OFF following the directions presented in this thread:

http://forum.xda-developers.com/show....php?t=2664460

but I am now currently in "relocked" state because I followed step 5 and tried running DirtyRacun.

Phone: HTC incredible 4g lte.
hboot: 1.15.0000
radio: 1.53.06.0919
OpenDSP-v29.1.0.45.0622

Thanks in advance!