How to fake the Vita's Region
Depending on your firmware and preference there are different ways to do this:
Fail-Mail trick - for firmware(s) 3.00 - 3.52
Backup Editing - for ALL firmware(s)
Note: Resetting the system settings will reset this region fake!
FAQ & Troubleshooting
My Vita says fatal error after restarting!?!?
Your Registry got corrupted. Just restore the default settings.
My e-mail shows a [?] instead of the photo symbol?!
Try resetting the Vita's mail account or resend the mail.