| Source | Availability | Notes | |--------|--------------|-------| | (zkteco.com) | ✅ Best option | Go to Support → Download → Firmware → Access Control → F18 | | Regional ZKTeco portals (e.g., ZKTeco USA, ZKTeco EU, ZKTeco India) | ✅ Often faster | Region-specific firmware may differ (hardware version dependent) | | Official ZKTeco FTP (historical) | ⚠️ Inconsistent | Some legacy links are deprecated; use support portal instead | | Authorized distributor portals (e.g., ADI, Anviz partner sites) | ✅ Reliable | Requires partner login |