Unable to Downgrade Unleashed Firmware on R770

[George]

Hi Expert,

I am unable to downgrade my R770 Unleashed firmware from 200.18.7.1.323 to 200.16.7.0.402 via the Local Upgrade page.

The R770 has an issue initializing Wi-Fi after completing the Quick Setup on version 200.18.7.1.323, so I would like to downgrade to 200.16.7.0.402 for testing purposes.

For reference, the AP was originally running the standalone firmware 122.0.0.0.722. I upgraded it to 200.18.7.1.323 for testing, but the Wi-Fi initialization issue persists(Hardware problem detected during AP [XX:XX:XX:XX:XX:XX] attemp to join [No Radio]).

Could you please advise how I can successfully perform the downgrade or how to setup the WIFI without problem?

Thank you for your assistance.

Best regards,
George Lin