| Version | Release Date | Key Changes | | :--- | :--- | :--- | | V2.1.0 | 2019-03-10 | Initial production firmware | | V2.2.5 | 2020-11-02 | Fixed Wiegand output delay issue | | V2.3.0 | 2022-01-18 | ZKAccess 3.5 protocol compatibility | | V3.0.1 | 2023-08-14 | Security patch: CVE-2023-2889 (hardcoded credentials) |

Use ZKTeco’s ZKBio Access or ZKTeco Time Att&Log software. Go to Data Management > Backup Data and save to your PC.

Required for real-time communication with ZKBio CVAccess .

Always download firmware from official ZKTeco channels to avoid bricking your device with incompatible or malicious files. Vulnerable upgrade mechanism in Zkteco F18 device