The new SDK has been released, including the updated firmware.

[zhu0629]

Download SDK:

Download Center->SDK->脱机通讯开发包-6.3.1.55

Devices

Model: nFace128
Firmware: 2MM510-1F40VA-Ver1.1.31
Software: zktime5.0 Version 4.9.1 Build20

Model: nFace128:
Firmware: 2MM510-1F40VA-Ver2.1.2
Software: zktime5.0 Version 4.9.1 Build23

New firmware requires the latest software version; otherwise, device connection will fail.

Maybe they have made significant changes to the communication password.

[kmkmahesh]

Not able to find SDK with that version.