You'd be better off asking at http://forums.dashhacks.com
That's where I go for my PSP needs. This site is more for PS3, like gbatemp.net is for Nintendo products. All the sites try to be cross system, but in the end they end up being quite specific. Like the "A NOOB's GUIDE TO INSTALLING 6.60 PRO- B9 Custom Firmware on PSP" has been on dashhacks for quite a while now. I've even considered adding it to a wiki.
As for your problem, no idea. The 3K units are a bane for hackers and just recently were hacked. Pandora won't work since that's for a specific set of 2K and 1K models. Try pulling the battery, then booting the unit while holding R. Maybe the boot strap is in place. Also try starting them without a MMC card.
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