u will loose all ur 3rd party apps from cydia and installer if u upgrade by clicking the upgrade button, not restore, u can then use quick pw to kailbreak and get cydia and installer
by just upgrading u are still unlocked
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:iphone: iPhone 8GB 1.0.2 OTB --> 2.1 Pwnage Tool
MacBook Pro OS X SNOW Leopard  and Sony Vaio Windows XP :hack:
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