HT201210 it show me error 1015.. what should i do

hi ... my iphone 3gs show me error 1015 when  updating  my phone....
pls tell me how can i restart and update my phone...

iTunes Specific error messages.
http://support.apple.com/kb/TS3694#error1015
"Error 1015: This error is typically caused by attempts to downgrade the iPhone, iPad, or iPod touch's software. This can occur when you attempt to restore using an older .ipsw file. Downgrading to a previous version is not supported. To resolve this issue, attempt to restore with the latest iPhone, iPad, or iPod touch software available from Apple. This error can also occur when an unauthorized modification of the iOS has occurred and you are now trying to restore to an authorized, default state.'
Downgrading iOS versions is not supported.

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