You can reset your iPhone to factory settings using recovery mode and a Mac or Windows PC running iTunes. However, the owner’s girlfriend’s Apple ID password is required to remove the activation lock before using the iPhone.
When you try to factory reset your iPhone, in most cases you will be asked to enter your Apple ID password before the iPhone is erased. If you don’t know your password, you can try to recover it. Method is as follows.
Why iPhone asks for password
[設定]>[一般]>[iPhone を転送またはリセット]>[すべてのコンテンツと設定を消去]Every time I try to erase my iPhone using , I am prompted for my Apple ID password to disable Find My (and thus Activation Lock).
Activation Lock is a safeguard put in place to prevent a stolen iPhone from being reactivated without the previous owner’s explicit consent. Entering her Apple ID password as part of the reset process removes the device from her account, disables the Find My service that can track lost devices, and allows the new owner to activate her iPhone.
To use your iPhone, you need to remove the activation lock. Doing so with a password by asking the previous owner to remove the device from their account or by proving you own the iPhone to Apple and submitting an Activation Lock support request. I can.
Forgot Apple ID password? Reset before erasing
Assuming the iPhone is yours and locked to your account, the password problem should be easy to solve. If you don’t know your Apple ID password, you can recover it using iforgot.apple.com.
Set a password you know, or use a password manager to securely record your passwords. After resetting your password on your Apple device, you may be prompted to enter a new password. The next time you try to reset your iPhone, you can enter a new password to disable Find My (and Activation Lock).
Erase iPhone without Password on Mac or Windows
You can also factory reset your iPhone without a password using a Mac or Windows PC, but it will not remove Activation Lock. This requires using Recovery Mode, a safeguard that allows you to update or restore your iPhone firmware in case something goes wrong.
Even after you use recovery mode to erase your iPhone, you can’t use your iPhone unless you enter the password associated with the Apple ID that locked your iPhone. After restarting the device, you will be prompted to enter your password to activate.
If you understand this and want to continue, see How to put your iPhone into recovery mode and how to restore or update your software.
Is Activation Lock enabled? Contact previous owner
If you purchase or give away an iPhone with Activation Lock enabled and you cannot use it without the password, you should contact the previous owner and ask them to remove the device from your account.
To do this, ask them to log in with their Apple ID credentials at iCloud.com/find,[すべてのデバイス]Select the iPhone in question in the dropdown,[アカウントから削除]Select an option.
Making sure Activation Lock is disabled is one of the key things to check when buying a used iPhone.