Removing Apple ID from a previous owner’s account : Find My iPhone Activation Lock

Learn how to remove a device from a previous owner's Apple ID so that you can activate and use it. 

 If your iDevice has already been erased

 If the device has already been erased, but is still linked to the previous owner’s account, you'll be prompted for the previous owner’s Apple ID and password during the device setup and activation process (shown below).

Fix Error code -36: iTunes could not restore the iPhone

Because not enough free space is available on the iPhone

Sometime when restore a backup to iPad, iPhone or iPod Touch by iBackupBot, an error may occurred, the error message shows by iBackupBot is Error Occurred, error code:-36. If try to restore the backup by iTunes, will get an error message iTunes could not restore the iPhone because not enough free space is available on the iPhone.
This error means that the free space on your iPad, iPhone or iPod Touch is less than the content size of the backup. We can check free space on device by launch the Settings app then choose the General tab then choose Usage, for example, as below picture shows, I have 1.1 GB free space on my iPhone:

 Then we can check the content size of backup that we want to restore by iBackupBot, select the backup in iBackupBot and check “What’s in Backup” section, as below picture shows, the contents size of the backup that I want to restore is 3.6 GB: