[Question] There was a problem de-registering iCloud from your device.

I'm trying to restore my Jailbroken iPhone (no this wasn't the jailbreaks fault this problem happened way before i jailbroke) so I can update without losing any space on my phone, however this message keep popping up when i try to turn find my phone off "There was a problem de-registering iCloud from your device." For the time being i've just updated my iphone however is there a way to fix this before IOS 9 comes out later today (UK).