Did you change the baud rate for your com port to 115200? 2.5Xtreme changes it from the default rate of 9600 so unless you reset it in TeraTerm you'll never see a bash prompt.
You can remove your DTivo drive and install it in your PC. Boot from either the 2.5Xtreme or TurboNet installation CDs and then mount your drives. I think the directions for mounting the drives are either in the Newbies guide or Hinsales How To. Both are found using the links provided on page 3 of the How Tos Only sticky thread in the DirecTV Tivo Hacking forum. After you've got the partitions mounted then type in the touch command exactly as written. Do a Ctrl+Alt+Del & shut down the PC when the POST screen is displayed and then reinstall the drive in the DTivo.
Please don't PM me or any other members looking for personal assistance. You'll do better by posting (after you've exhausted the search feature, of course) and taking advantage of the collective expertise of the membership instead of a single individual that may or may not be able to help you. Thank you and enjoy your stay at DDB!