I bought the iPhone 5s from the hands, it was iCloud this person, can I untie the phone from this iCloud?
We have repeatedly warned that when buying an iPhone or iPad, you must necessarily require disconnecting the device from the iCloud of the previous owner.
Otherwise, you get a “time bomb”. A password from iCloud is absolutely necessary if the device restores the firmware or backup. Without a password, you can not reset the device to its factory settings.
The worst outcome is blocking the device. It can activate the former owner, the iPhone in this case will not work until the password is entered.
At the moment there is no way to untie an iPhone or iPad from iCloud without using the old owner’s password.