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Perform a factory reset on the physical machine if necessary ( Main Menu > System > Reset ).

If individual devices are clear of physical faults, the issue likely resides within your central management console. Step 1: Clear Device Memory zkteco authentication failure solution best

If the device randomly rejects users, the flash memory might have corruption. Perform a factory reset on the physical machine

Enter the administrator password. (The default password is 1234.) www.zkteco.com.br User Manual - zkteco.me zkteco authentication failure solution best