Help jailbreaking my device?

So i have an Iphone 4S, version 6.1.3. I downloaded Redsnow for 6.1.3 and downloaded the 6.0 firmware.
Once i opened redsnow i went to >Extras,
>Select IPSW and i selected the firmware i downloaded. But it keeps saying firmware is not compatible with this version of redsnow. What am i doing wrong?

6.1.3 can't be jailbroke on the iphone 4s… 6.1.2 was the last JB

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