Check my thread
here. I recommend downloading the stock no-root image (the rooted image has been reported to be having problems) and bads3ctor's tu_root file (if you want root, CWMKeeper from the backup post if not).
Quick and dirty instructions:
1. Move tu_root/CWMKeeper to the root of your sdcard, and extract the no-root zip to your clockworkmod/backup folder.
2. Go into recovery, flash the no-root recovery, then flash whichever zip you chose to download.
3. Find PH8AL's post about manually updating the baseband (requires root), and follow its instructions. Keep in mind to change "basebandFF27" to "basebandFG11".
Another option, if you have the patience is wait till this weekend, and I will be updating my thread with full instructions on how I made the backup, as well as the image itself.