Unfortunately, once an iPad is still tied to a DEP/MDM assignment at the Apple level, there isn’t a way to remove the management profile just by resetting or restoring the device itself — the enforcement comes from Apple Business Manager, not the local settings. If you can’t access the original ABM/MDM portal or recover the Apple ID that was used to enroll the device, the official channels basically have no mechanism to break that link without proof of purchase. In situations where the dashboard isn’t available and you just need to regain use of the hardware, maybe you can search for some magfone n ipad mdm remover tools ti remove it from your the ipad.
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