It's installing on my PSP Phat now. If it sucks, I can always go back to 1.50 then 3.52 M33-4 to play 1.50 kernel homebrew, but I'm going to test my favorite games/homebrew first.

EDIT: In Recovery Mode, there's an option for 1.50 kernel for the Game folder. I thought it only had the 3.71 kernel?
EDIT 2: I changed the Game folder to 1.50 kernel, and USBSSS doesn't work. GeMP, however, does.
EDIT 3: I changed it to 3.71 kernel, and it's the same. I think that was just put in as a mistake. (Also, when changing Game folder kernels, it says it's switching to 3.52, but comes up as 3.71. Weird.)

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