How can I downgrade an operating system our bluetooth worked ok on the 4.2.1 system but now we are on the latest system it does not work properly so how can we get the old system back

how can I downgrade my operating system as my bluetooth work ok with my holde commodore on the 4.2.1 system but now it is upgraded to the latest system it does not operate properley

thankyou but it looks like we won't be buying another iphone

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