My iOS 4.2.1 firmware not compatible to upgrade? Why is that?

I am trying to update using an external ipsw because itunes won't show me the updates, it says 4.2.1 is the latest update and would'nt let me update to any other version. Now, when i Option+Click on Restore or on Find update it says that my firmware is not compatible, so it won't let me update.
What can i do?
Lion is updated so is iTunes.

iPhone 3G ( that's what you have if your latest firmware is 4.2.1 )  is not compatible with iOS5.
If you had a 3GS, your last firmware before 5.0 would have been 4.3.5 .
What what about "external firmware" ?? itunes is the only way to make sure to load the correct firmware. It searches for the correct one on Apple's servers and will tell you once it has one for you. If Itunes says you can't have iOS5 then most probably this is correct and due to the fact that you have a 3G, not a 3GS.
Do you want to brick your phone by risking to load incompatible OS onto it ?

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