: Some models allow a reset if you trigger the tamper switch on the back while the device is powered on, though this may require a specific sequence within 30 seconds. Official Support : For high-security devices, contact an authorized ZKTeco distributor
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He pulled up the manufacturer's documentation on his laptop. It was useless. The official support line was a voicemail box in a different time zone. The manual recovery method required a "master code" generated by a proprietary tool—a tool the previous IT guy had taken with him when he left. : Some models allow a reset if you
