Install MolecularShell: https://www.youtube.com/watch?v=bQEPnRMP5cg
Install VitaShell: https://www.youtube.com/watch?v=q8W5jnv17xk
661 OFW: http://www.mediafire.com/file/9mi5dvf6ibr3uim/661_OFW_2417.zip
Easy Installer: http://www.mediafire.com/file/1ygg3ag44jy34q0/AdrenalineEasyInstaller.vpk
Step 1: After downloading the Easy Installer from above, either connect you PS Vita using the MolecularShell FTP or VitaShell USB and Navigate to the ux0:/ Root of the memory Stick.
Step 2: Copy and paste the adrenalineeasyinstaller.vpk in this folder here. Once done exit FTP/USB and return to the PS Vita.
Step 3: While in MolecularShell/VitaShell, navigate to the ux0:/ Root and select the adrenalineeasyinstaller.vpk and press X to install and the X again to confirm.
NOTE: You WILL NEED a PSP game installed on your PS Vita in order for these next steps. If you don't have one, copy one over either via Content Manager or PS3.
Step 4: Exit your MolecularShell/VitaShell and scroll till you see the Adrenaline Easy Installer on your XMB and press it to Start, Once booted it will Scan for the necessary folders/directories and then bring you to a menu.
Step 5: Select Install Adrenaline on the menu, If you DO NOT have a 661.PBP file dont worry it will download it for you and if it doesnt, I have one for Download in the Link above.
This is now installing the directories needed to run Adrenaline eCFW. it hase created a ux0:/pspemu/adrenaline directory and placed the adrenaline.skprx and adrenaline.suprx in this directory. It has also modified the ux0:/tai/config.txt for you, and patched over the game that you've selected for you.
Step 6: Once the installer completes your going to be asked to reboot. Disconnect your USB during reboot and allow the PS Vita to rebuild the Database and then just Use the HENKaku exploit and then successfully boot up Adrenaline from your XMB.