Well, if it came with 3.60 or higher when you first bought it, then there's nothing you can do with it, until KaKaRoTo releases his 3.73 jailbreak.
Originally Posted by PS3DevWiki
2) Datecode 1A/1B : has new metldr and fails downgrade to 3.55 with blackscreen and shutdowns in 1-2sec without blinking LEDs/beeps
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