Need 1.6.5 Firmware

Just received a shipment of new WIZ145SRs. 2 of them have firmware 1.6.5. The other has 1.5.0.
I would like all of them to have the same firmware. How can I obtain firmware 1.6.5?

We apologize for the inconvenience.

Regarding firmware download, please refer to official homepage link

Direct download 1.6.5 Firmware

Thank you for quick help!
Dave Barribeau