If you don't feel like downgrading, don't expect to run any homebrew. Sorry but that's the simple fact of the matter. It just won't work. No amount of coding will change that, unless Sony gives in and makes the firmware open (not going to happen any time soon).
I traded for a second PSP so I could mess around with custom firmware (I lucked out and it came with the latest OE at the time).
It up to you what you do, but if you stick to updating with official firmwares, no homebrew for you.
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