Locked mdm profile
I bought a used iPhone with MDM profile locked. What can I do??
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Activation Lock on supervised devices
You can use a compatible MDM solution to enable Activation Lock during setup or when the user turns on Find My. Then you can clear Activation Lock to erase the device and deploy it to a new user. Learn how to manage Activation Lock with Profile Manager. Or refer to your MDM solution documentation for details.
If you are the owner or the owner has shared all information with you then to open Activation Lock:- If it is Activation locked, read here --> Turn off Activation Lock - Apple Support Activation Lock for iPhone, iPad, and iPod touch - Apple Support
Learn how to remove a device from a previous owner's account.
If you are not the owner and do not have the Apple ID and Password then there is no way that you can get into this iPhone unless the original owner shares the Apple ID and password with you. If you are lucky you can get into this iPhone if they (owner) accidentally remove the device from their apple ID.