I set a password on my PS Vita, and my brother somehow restored my data (meaning he deleted it). Can I get it back?

So, basically, I set a password on my PS Vita and my brother decides to mess around with it. I don’t know how, but he somehow restored the Vita, which means all data and settings are deleted and set to original settings.

It’s a factory reset, basically.

I did a little investigating, and here’s what I came up with.

I don’t think that it reset the Memory Card. I have one, but it doesn’t say that it would, but even if it did, whenever I put the Memory Card in after taking it out, it says that a Playstation account is linked to it, and it asks me if I want to link it.

Yes, it’s my account. But the weird thing is, it detects the Memory Card externally, but not internally, with the settings. So it detects when I take it out, meaning it shows notifications, but when I click the following in settings…

"Playstation®Mobile"

It says…

"No memory card is inserted."

So I’m confused.

I’ve tried to get to Safe Mode a couple times, it doesn’t bring me there.

My question, obviously, is how to get my data back. I am fairly sure I still have the data on my memory card, and the external system detects it, but Content Manager, Settings, etc. don’t. So how?!