Problem using siri on iphone 4 ios 6.1?

I have a problem using siri in my iphone 4.recently i have upgaded to 6.1 and i have jail brake it and installed siri on my iphone 4. Its fine but when i open general>siri then i have seen that siri is been off and when i trying to enable it is done for a while when i go back and *** again i have notices that siri is been off so please tell me what to do. And i have downloaded it from ihackstore.com/repo please tell me what should i do so that siri will work in my iphone 4.
thanq

Siri does not work on the iPhone 4.

You need an iPhone 4S, iPhone 5, iPad 3, iPad 4, iPad Mini, or iPod Touch 5th gen to get Siri. The iPhone 4 is not officially compatible with Siri.

Try using sara.here is the link.http://www.geeknaut.com/best-cydia-apps-21195126.html.works wel with me.