Actually activating a vita tv is kinda different (I forgot that you can't use the usb port on vita tv to transfer games).
You are going to need to read the guide on this article to setup vita update blocker:
http://wololo.net/2015/05/15/vita-update-blocker-working-for-firmware-3-51/
To activate your PS TV (a ps3 console with access to ps store and psn is recommended):
Step 1 - Link a psn account on your ps vita (it's highly recommended that you use a account that only you have access because you can activate only 2 vitas with one account), you can do it by perfoming a system restore.
Step 2 - Acquire any free Vita content (free to play games like treasure of montezuma works) and download it on the ps3.
Step 3 - Set your ps tv wifi or ethernet connection to use ps vita update blocker proxy, access the PS Store on your vita tv
Here we have 2 options:
Step 4.a - Without PS3: Download any free Vita content on your ps vita tv, you can try accessing your download list at ps store to get your free to play game. But sometimes the console will ask to update or log you out of store.
Step 4.b - With PS3: Open content manager on your vita tv, make your vita tv access the ps3. Copy the game, your vita tv will be activated without upgrading the console firmware.
To exploit:
Step 5 - Purchase one of the games listed in this image (
http://www.zload.net/bilder/PSVita/VitaExploitChart.png ) that have the following information: 3.20 (or higher) and below, eCFW/Bubbles for PSP games and PS1 Loader for ps1 games. Mind that you have to purchase the correct title for your PSN account region.
Step 6 - Search on wololo the guide to install the specific exploit games that you've had purchased.
You are going to need QCMA to backup your games.
I think that this guide will help:
http://wololo.net/2015/05/16/how-to-connect-your-lower-vita-firmware-to-your-pc-via-wifi/