iXpand Base not working with iPhone or Windows 7

I’ve got an iXpand base which has worked well with an iPhone 8 up until recently. Now, when connected, it says the base isn’t recognised.

I’ve attempted to plug the base into a Windows 7 laptop to update the firmware. The base appears as a removable disk, but the firmware update tool says the iXpand base unit isn’t detected.

What can I do to get the base working with the iphone again?

Thanks for any help.