Basically this is a 2 step process.
The EML is a shortcut of sorts for desktop mail apps. Its payload allows you to write directly to the memory card.
EML
https://www.dropbox.com/s/ms6kx2b3xjx8l1g/writer.eml?dl=0
You download this file and open it with a desktop client and send/forward a email to yourself (Most use Thunderbird as it's free)
Once this is done and you have access to this email on your PSTV, you simply click on the attachment/camera icon. You will get a message saying image cannot be opened. This is suppose to happen. Do NOT click OK.
Hit the PS button on your controller to get back to the main menu.
Now close out the email app and relaunch it. If the first step was successful you will be asked to enter your email credentials anew.
Go ahead and do so.
Now download the whitelist
https://www.dropbox.com/s/d6gef9cx07n7kx6/list_launch_vita.dat?dl=0
You need to rename this to
#0 with no file extension.
Draft another email to yourself and attach the #0 file.
Be sure to have the subject line read:
ur0:game/launch/list_launch_vita.dat
On the PSTV open the email and click the attachment.
You will get the same error of image cannot be opened.
Again press the PS Button to get back to the main menu.
NOW
Try a formally unrunnable game.
Protip: Use a Dual Shock 4 to emulate the Vitas front/back touchpads. Once in-game long press the PS Home button and enable TOUCH POINT CONTROL
Enjoy!
Also if you run into issues with gmail not letting you log into your account because it is a less secure app, you have to change your email settings here to allow it to do so.
https://www.google.com/settings/security/lesssecureapps