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CAN I JAILBREAK MY PS3 USING AN IPHONE3G WITH PSGROOVE WHILE'S MY PS3 IS ON THE LATEST FIRMWARE (I THINK IT'S 3.50)

is it possible in anyway to jailbreak ps3 with other than the jailbreak dongle itself as well as being on the latest firmware?

Thanks.

No, No, No, NO!!!!!!!!!!!

How about downgrading the FW?
removing the PS3 OS and re-installing a previous version?

Nop, downgrading is not possibal.

Answers for your questions:
1. You can't Jailbreak with Firmware 3.50.
2. There is no way to downgrade your PS3.
3. Yes, you can Jailbreak without the Original USB Dongle.