Documentation on the Infinity project for maintaining system settings across reboots.
The answer depends on your motherboard.
You will need the actual CFW files. Since direct links to homebrew sites are often restricted, here is how to find the correct files:
The blue light of the PSP-3000 flickered in the dark room, casting a pale glow over Leo’s face. It was a relic of a different decade, a sleek slab of black plastic that had sat in a desk drawer for years. Today, he wasn't just turning it on to play an old save file; he was giving it a new soul.