So since the PSP is hacked to crapola! — and Sony isn’t suing anyone who targets it — developer some1 has released PSP Downgrader v4. And in addition to 6.60 support you can now downgrade to any official firmware, but — more on that after this…

This downgrader, originally developed by[You must be registered and logged in to see this link.] for 6.31 and 6.35, which some1 ported to later firmwares — 6.38, 6.39, and 6.60 — now lets you downgrade your PSP not only to 6.20, but any official firmware (OFW) you so desire. Although with that, comes this: You can only downgrade to a firmware greater than or equal to the factory installed OFW when your PSP was purchased; this downgrade has not been fully tested with all the different PSP models and OFWs; I wouldn’t try anything silly, like jumping way back to firmware 1.50; we are not responsible if you damage or brick your PSP.

The firmware 6.60 downgrade is made possible by a (new?) kernel exploit discovered by Davee; that was then passed down to Zecoxao, who later made said exploit available to some1. So mad props to everyone — full circle!

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is it safe to downgrade to 6.39?

Well probably, since all PSP's were shipped with 631 and under.

but i just got my psp a week ago ...its a 3000 and as soon as i got it updated to 6.60 can i downgrade sttill cuz i want to but dnt wanna brick my psp ... !!!!

Question already answered in a PM.

Hehe, you're always the first one to post the new releases. Anyways, this sure beats having to downgrade twice for those people who have a firmware above 6.20 to try to get to 5.00.

They won't get m33

All you need is temp -_- (A.K.A 6.39)

Video is uploading now. Its simple, just like every other one of the released downgraders. You won't even be able to start an "unsafe" update, because he reworked it to fake your version as the IPL version, i.e. the version your PSP was shipped with, which allows you to start a higher update. If you try to run the 3.71 update on a PSP 3000, 04g, with this downgrader, 99 times out of 100, you will freeze, no harm done to your PSP.

Check your PSP's module to find out how far to downgrade... er... or just install 6.60 PRO B9

I saw the beta on 10 the other day. But didn't know 9 was out.
Please send the PRO-B9 link to Species so he'll stop spamming.

Video tutorial on using the downgrader:

any way that can brick????

I don't think so, because if you are using the downgrader incorrectly as Sworn said above it will freeze and no harm will be done to your PSP.