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I changed devices and want to purchase the subscription for it, but the system won’t let me do this. It only shows the old UDID on the main builds.io page. How do I register my new device?

If you have restored from a backup copy, try hard resetting the device. (Power+Home, or Power+Volume Down on iPhone 7 and later) After that, our system will obtain the new UDID. Login with your existing credentials and you'll receive an offer to register your device.