Step 1: Create and overwrite/delete empty id.dat file

Depending on your firmware there are different ways to do this:

Fail-Mail trick - for firmware(s) 3.00 - 3.52 Show / Hide

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If this is the first time you are going to use this Mail-Installer method,
please make sure to follow this tutorial on how to set everything up first!

1) Create a new file on your desktop and name it #0

2) Now you are going to write a new e-mail with the empty #0 file as attachment and the path we want the file to be installed (ux0:id.dat) as subject. Send it to your vita!

3) If everything did go right you should see a camera symbol. Touch it and DO NOT click OK on the appearing Error Message but simply close the e-mail app completely!

HENkaku - for firmware 3.60 Show / Hide

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1) Open your browser, go to henkaku.xyz and install the Homebrew Enabler

2) Open molecularShell and navigate to ux0:/

3) Delete the id.dat file and shutdown the Vita.

Done! You should now be able to put this memory card into any other Vita without the need to format!

But remember that you will need to redo this process every time you want to swap again!

FAQ & Troubleshooting

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After putting the memory card in the other Vita it restored itself.

No idea why. Shit happens.. :/

I can't start any of my games on the other vita?!

Thats normal. The games are still tied to your other account.

Is it possible to swap between a normal Vita and a PSTV?

Yes it is!

My e-mail shows a [?] instead of the photo symbol?!

Try resetting the Vita's mail account or resend the mail.