ZKTECO Sync Troubleshooting

I need help resolving data sync issues with ZKTECO biometric access control devices.

Current Problems:
- Data not syncing between devices

Troubleshooting Steps Already Taken:
- Restarted the devices
- Checked network settings
- Updated device firmware
- Attempted to establish remote device data sync in Biotime software

Requirements:
- Experience with ZKTECO devices and Biotime software
- Strong troubleshooting skills in network and device sync issues
- Ability to provide a step-by-step solution or remote support