http://androidforums.com/showthread.php?p=6660832
To boot up cwm, you'll need to expose fastboot. To do this, download terminal emulator and grant superuser permissions.
Back up your laf partition:
dd if=/dev/block/platform/msm_sdcc.1/by-name/laf of=/sdcard/laf.img
Nuke your laf partition:
dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/laf
When that is done, turn off your phone, and when completely off, hold the vol+ button and plug it in to your computer. After fastboot loads up you can let go of vol+.
http://androidforums.com/showthread.php?p=6668157
Now you can boot into cwm:
Fastboot boot cwma1.img