I forgot the password of my iCloud account. I'm using iPhone 4S I am afraid that if I updated to the new iOS, the phone will be locked and I wouldn't be able to use it. P.S. I have tried iForgot to restore my password, but it didn't work out as it keeps telling me that my answers are wrong.
IOS – Does the iPhone ask for iCloud password after updating to iOS 8.1
apple-idicloudios
Best Answer
Yes, you will be required to verify your account when you first log in.
I would suggest trying to get to the bottom of it BEFORE you upgrade, it will be harder after (since you should still have some access to email accounts etc).
Also, I would research the effects of running iOS8 on an iPhone 4S. Although it may be supported, I would think it would be incredibly slow.
I know you didn't ask for the second part of this answer, but I would strongly recommend you do some more research on this before blindly doing it.