Also, you can go back and fourth with upgrading and then downgrading, then back up if you need to. every once in awhile if i need to change a vin or need tiny tuner for something. ill downgrade back to 2.x, upload a bin into a hex editor, change vin, save, upload to TT, make necessary changes, save, then upload the bin to HPT and flash. Then for the nicer scan functionality of 3.x ill re install the newest version of hpt. trust me you wont get froze out of being able to go back and fourth, ask anyone whos been using HPT for a long time, they know what im talking about.