Through the power of homebrew.
Just takes a simple email, read via the PSV email app of which is preinstalled on each device.
http://hackinformer.com/2015/09/24/mr-gas-releases-methode-to-write-to-the-vita-filesystem-pstv-whitelist-patch/


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1. Download this file: https://www.dropbox.com/s/ms6kx2b3xjx8l1g/writer.eml?dl=0

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2. Open that file with a compatible email client (such as thunderbird), and forward it to your email account registered on the vita's email app.

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3. Load the vita email app. Locate your email and load it. You should see something like this:



Click on the attached image. You will now get this:



DO NOT CLICK OK. Instead, hold the PS button and quit the app.

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4. Go back into the vita email app. The settings have now been cleared, so log back into your email. The client is now hacked.

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5. Download https://www.dropbox.com/s/d6gef9cx07n7kx6/list_launch_vita.dat?dl=0 and rename it to #0 - make sure there is NO file extension. Enable file extension editing in windows if you havent done so already.

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6. Email it to your vita's registered email address with the title of ur0:game/launch/list_launch_vita.dat

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7. open it like before. quit the app.