IOS 6.1.3 is giving problems Any way we can down grade to previos iOS

After updating iOS 6.1.3 my 3gs wifi strength is low and disappearing. Any way can we down grade to previos iOS 6.1.
Please help on this. Backup it is not helping ( i lost 11 days data) dont post such answers.

I tried still the same. I think downgrade is not possible. When I updated automatically is keeping the backup. But that backup only for our datas not for the previous IOS. Apple should do somthing for this.

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