1.Buy 3.60 board
2.Replace the board
Voila
this won't happen for many years. your best bet is a motherboard replacement on the same device (the motherboard must have 3.60 or lower!), or a second one on 3.60 or lower.Thanks. But it's impossible, nobody sell it at my location. I hope henkaku upgrade support firmware 3.67

You can easily get one from, say, Aliexpress.Thanks. But it's impossible, nobody sell it at my location. I hope henkaku upgrade support firmware 3.67

Worse option than a mainboard replacement.Other option is to sell it and buy new one
Actually it depends, if he can't get motherboard easily and/or doesn't have experience/skill/courage to change the board, it's better.Worse option than a mainboard replacement.

I mean, it really isn't as complicated as it sounds. If I can do it, with hands as shaky as mine... Well. Anyway, finding a 3.60 Vita is often more work and costs more, which is why I dislike that option.Actually it depends, if he can't get motherboard easily and/or doesn't have experience/skill/courage to change the board, it's better.
Don't want to mess up something more than necessary

Most of the electronics I own aren't sold locally.Thanks. But it's impossible, nobody sell it at my location. I hope henkaku upgrade support firmware 3.67

Yep, PSV mainboards are fairly inexpensiveMost of the electronics I own aren't sold locally.
You can order stuff from abroad, you know. Chimon brew, aliexpress is the way to go. I'm pretty sure mobos go as low as $25US.

. They're really cheap or if you still want to pirate, either sell that one and get a new hackable vita or get a 3.60 mobo. Your choice. Also, you shouldn't have connected it to a wifi. Oh well, what's done is done. At least your console still works.