HT4528 I have the 4s and i downloaded ios 8 but nowmy battery will drop from 100 to 0 in 30 mins without me using it. it has also happened to my sisters phone and our upgrade isnt until december. how can i get rid of ios8 for anyting else?

I have the 4s and i downloaded ios 8 but nowmy battery will drop from 100 to 0 in 30 mins without me using it. it has also happened to my sisters phone and our upgrade isnt until december. how can i get rid of ios8 for anyting else?

Downgrading the iOS is not supported.  Basic troubleshooting steps are restart, reset, restore from backup, restore as new device

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