That's the first thing anyone ever tried, ever since the beginning of PSP homebrew. No, it won't work.

Why? Well, the update EBOOT's are all "signed" with a Sony-issue key that is impossible to get outside the company. Unsigned EBOOT's won't run on the PSP, it must be signed and encrypted to run. If you were wondering, "Well, why doesn't anyone just borrow the signature off an official update?", there's a catch there too. The encryption technique parses the entire eboot, then signs the entire thing with a unique custom-fit key. If 1 digit of data is changed, the signature will be rendered invalid because the key won't match the EBOOT anymore.

If we could just break the encryption or get that key(stolen SDK! *gasp*), we'd be golden; homebrew would know no bounds, as we could run anything on any version firmware. Of course, then you'd have to follow the Xbox scene, and all homebrew would be technically illegal(which is why all Xbox homebrew is released through IRC, over FTP, or through bittorrent) because they'd be signed with a stolen devkit...that's how they make Xbox homebrew, with a stolen SDK.

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