How to downgrade Iphone 4s ios8.1.3 to ios 7.1.2    ???

I heave problems with some apps in my iphone 4s. My car audio (Pioneer) no more understand my Iphone with ios 8.... before with ios 7.1.2 be OK

PIONEER   AVH-X7500BT
For AppRadio users and users of Pioneer DVD receiver and navigation receiver models with AppRadio Mode, Pioneer has completed its compatibility evaluation of iOS 8 with AppRadio Mode.  Please see below for important information:
iPhone 6 Plus, iPhone 6, iPhone 5s, iPhone 5c, iPhone 5, iPhone 4s and iPod touch (5th generation) users:
The following AppRadio Mode applications are currently not compatible with iOS 8 due to a stability issue that results when using the in-app keyboard.  To maintain AppRadio Mode use of these apps please avoid using the in-app keyboard or continue using iOS 7.1.2 with your iPhone or iPod touch.

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