The HTC Vision is also known as the HTC Desire Z and HTC G2.
Instructions: Download root_files.zip - HERE
The first step is to install Terminal Emulator (here) and a file manager from the Marketplace, such as, Astro file manager. Now insert the SD card to your computer and unzip the “root_files.zip” file (download link given at the bottom of this post) to this SD card (a directory will be created called root_files on the card).
When done, unmount the SD card from your computer. Make sure that all the extracted files are directly inside the root_files folder and not in another subfolder inside it.
Enable unknown sources (under Settings –> Applications) and USB Debugging (under Settings –>Applications –> Development). Using the file manager (we are using Astro file manager), navigate to the root_files directory on the SD card (created in step 2), and select “com.modaco.visionaryplus.r14.apk” to install the Visionary app. Launch the Visionary app and click on “Temproot now”. Leave the other settings unchecked. Start the terminal application and type the folowing:
cp /sdcard/root_files/perm_root /data/local/perm_root
chmod 777 /data/local*
The first command changes the rights to super user, the second command copies files to the directory /data/local/perm_root, the third command changes the rights of files in data/local, and the last command launches the script.
As the program is executed you will see a number of messages scroll by. Once you are returned to the prompt in terminal, you will have permanent root, as well as subsidy unlock and Super CID.
Your phone is now rooted and you can verify having permanent root by holding the Volume down while powering on the phone (see S-OFF in the first line of the bootloader) or by installing Superuser app from Android market Here is a link to a flashable zip to install the latest Superuser. Download
DISCLAIMER: Affaf or Addictive Tips, XDA Developers and RootzWiki are not liable or responsible for any damages to your phones, this is solely the users decision to "root" their phone. Enjoy!