Well if you're on 3.30, update to 3.55 CFW and then install "Factory Service Mode v0.2". "This tools is an XMB application that places the PS3 into factory service mode. A downgrade dongle is not required anymore."
Look for it here.
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Also, download "Get out of FactoryServiceMode"
Here is tutorial on how to remarry on 3.55:
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Here is where to get the files:
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Here is for 3.30OFW:
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Follow direction you should be fine. Make sure to run a Blu-ray movie before getting out of FSM.