Go to Settings > About Tablet > Tap "Build Number" seven times. Then, in Developer Options, enable USB Debugging.
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This happens when the ROM script verifies the device model name and rejects it. Ensure your recovery is updated, or edit the updater-script inside the ROM zip file to remove the device assertion checks. Go to Settings > About Tablet > Tap
Hold Volume Up + Power until the Lenovo logo appears, then release Power but keep holding Volume Up. in Developer Options