The website that I thought was openps2loader's home site appears to be down (I can't post links, but it'll be one of the first results in google if you search openps2loader). I'm not sure if it's an official website or just something else. Thought I'd report it as I didn't see anything about it mentioned here and it was up about a week ago when I set up OPL on my PS2 (I'd been using HDLoader for years).
i used this one openps2loader.info but its offline now so you can use this one for guide or etc..
Official OPLv0.8 User Guides