This Method for FULLY remove icloud account and Restore or erase your iphone it has extra steps please read the steps
First i don't Take Credits for any of this and i didn't looked it up who found it first Diamond or iclarified or who ever
am just posting how to after i tested the following steps
Please notice that Phone must be WORKING
Here's how it works:
1. Navigate to iCloud in Settings.
2. Select your account.
3. Change the password to an incorrect one then tap Done.
4. Tap OK when warned that it is the wrong password. Then tap Cancel.
5. Reselect your account.
6. Empty the description field and then press Done.
After following those steps, Find My iPhone is disabled. but you still can't restore it or Erase ,Wipe it
please notice after this if you wipe or restore you still will be asked to enter icloud account
-Now Delete Account and Your phone is icloud free
-Add Your iCloud Account (ofcorse you know the password )
-Disable Find my iPhone normally
-Delete iCloud Account (This is very very important if You Don't phone will ask for linked icloud when activating i will upload video later
-Now Your Phone is ready for restore and wipe
here's Video i made it myself
Completely Remove iCloud Account &Restore,Erase Your Phone
Tested by me and 3lsheikh
Thread is opened for test and updates
For iPhone 4 only (downgradable phones ) i think new method will be released soon even if the phone isn't working and not activated
Try it on your own risk and please Test and Report as Appreciate for at least my time