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How did you fix this problem?

I am running 4.3.3 and I tried upgrade too ios 5.0 on my 3gs and came across the same issue .. if you can help me out I would appreciate it!
 
Incompatible

Yeah, after 45 minutes of downloading and more of installing - then it says, can't install because incompatible - huh???? I thought the 3Gs was okay.
Any suggestions?
 
iPhone2,1_5.0_9A334_Restore.ipsw <- this is the correct software for iPhone 3GS, so are you sure you have the right one, why im telling this, i had the same problem until i discovered that i had the wrong ipsw file, so i downloaded this, and viola, worked fine.. :)

And if you say you have the latest itunes, it should not be a problem at all..
 
That was it - I downloaded, and then installed the update on the iPhone, and now it is in the process..... Thank you!
 
Restore on a different computer. I wanted to restore my new my new 4S because I was having syncing problems and was getting the same error. After a fresh restore my problems disappeared.
 
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