How can I flash back to the stock rom for HTC EVO 4G/Supersonic using just the phone and clockwork mod recovery and/or rom manager? I need to flash back to my stock rom for just a few minutes to get my GPS working again (http://code.google.com/p/cyanogenmod/issues/detail?id=2090&amp;colspec=ID%20Type%20Status%20Version%20Model%20Network%20Owner%20Summary%20Stars%20Priority). Everything I read says I need windows to do this, is there a rom I can download and just restore it with clockwork mod?
http://goo-inside.me/evo/stock/ruu/ provides a straightforward guide, reproduced below, of how to revert to a stock ROM, and it looks like all you need is ClockworkMod.  You probably want the newest Dec. 15th software linked on that page.  Heed the warning!


  WARNING! RUU'ing your phone will wipe all data on your phone, and if done incorrectly, can BRICK your device permanently!
  Performing an RUU entails completely wiping your user data, removing root, removing your custom recovery, and switching to the specified radio, hboot, and stock Sense ROM version that's in the file name.
  
  Instructions:
  
  
  Download the UnrEVOked Forever S-ON tool and flash from ClockworkMod or Amon_RA recovery.
  Download ZIP file for whatever software version you want to restore to. Note that you may not be able to downgrade, depending on your current software version.
  Check MD5 (Windows: HashCheck, Linux/Mac: Use md5sum comand from Terminal).
  Rename file to "PC36IMG.zip" (ensure that you do not have file extensions hidden, aka, that the file is not now "PC36IMG.zip.zip")
  Place file on the root of your SD card.
  Boot into hboot by powering off phone, then holding down Volume Down and Power until you are taken to the white screen with the skating Androids at the bottom.
  When asked if you want to flash the file, press Volume Up to confirm. The remainder of the prompts should be self-explanatory after that.