Yoshihiro is looking for Donations or even a bricked PSP v1.51 or v1.52, heres what he says:
"I've already downgraded a PSP 1.52 JAP with success after not finding a PSP 1.51 for testing. You can find the 1.52 update on all sites, and after you downgrade, :=) (he also adds this: nothing out if i dont have a psp 1.52 eur)" Which is needed for further testing and to make sure PSP's will not get bricked with this"
Those interested in helping Yoshihiro and thus helping the scene can either contact him at irc.blackcats-games.com #wab or donate to his cause below (paypal button)