Unable to update iphone 3gs software?

I just got an iphone 3gs and i'm trying to JB it so i can use it on tmobile but the software is on 3.1.2, when i try to update it to anything new it says "iPhone2.1_4.3_8F190_Restore.ipsw" was not copied to the iPhone (insert name) because it can't be played on this iphone."
says this with later updates as well. Any help?

If you are trying to update your iphone on internet and your phone is connected with pc via bluetooth or data cable etc. Then it may be issue that file is not downloaded properly. Connect your smart device (iphone) with computer, during this session don't use your iphone. And follow all steps which it says. Have a good time.

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