: Before updating, use your management software to back up user templates and attendance logs Factory Reset
for a specific ZKTeco software version like BioTime or ZKAccess? ZKBio-CVSecurity-6.0.0-User-Manual_EN-v1.0_20230616.pdf
and wait for the "Successful" notification before rebooting the device Important Precautions Check Model Version
Firmware updates generally do not delete user data (fingerprints/logs), but it is standard safety protocol to backup first.
Verify the firmware exactly matches your model and hardware version (e.g., SilkID vs. standard optical sensors). Zkteco Europe direct download link
You need this information to ensure you are downloading a version.