The device I received failed a thorough examination. It was MDM (Mobile Device Management). This means that whoever registered it with Apple is their company. It's similar to an iCloud lock, but if you instead erase the drive and proceed with installing the operating system (even on a different hard drive), the serial number will ping your Apple servers and prompt you to install profiles that match the company's settings correspond to. What disappointed me the most was that it was "updated" and supposedly tested. If you don't spend an extra 20 seconds on it, it suggests that this seller cared about profit, not people. Although I received a refund, the experience itself is very daunting. Buyer Warning.
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