GUI switch GS716-100EUS management not accessible via the GUI (HTTPS)

I have a netgear switch mentioned in the subject. I recently got an email from NEtgear saying that there is a new firmware for my switch type that is available for download. See attached snap shot...

The new firmware addresses a bug which I believe is also affecting my switch because I assigned a fix IP address via DHCP router.

Switch is working fine however I cannot get access via the GUI (https). There exist a new firmware for this but I cannot implement this because of this bug. Beside the GUI, is there another way to connect to the switch and update the firmware? 

I would like to avoid full reset of the switch in order not to loose the complete configuration!

Thanks in advance

Maarc