I've got both a slim Vita and PS TV with Enso 3.65. I'm using an sd2vita on the Vita and I use an external USB stick on the TV for extra storage, etc... So, I no longer need all of my proprietary vita memory cards (2x8GB and 2x16GB). I'd like to sell them. But want to format them first. When I hacked my Vita and TV, I did it without any memory cards. So, none of my memory cards have Vitashell or anything else on them, except games that I had loaded on several years ago (before I knew anything about hacking...) How do I format them safely?