My DDJ SX isn't updating to the latest firmware (MAC)

I have been experiencing problems recently with my sound cutting out, through headphones and speakers. It only happens when I turn on my DDJ-SX.

I thought this may be due to the firmware being out of date as I haven't updated it in a while. I downloaded the latest firmware update and Java but it says that my DDJ-SX isn't connected, even though it is registered by my mac as being connected.

I have updated my mac to the latest sofware 'Monterey' and tried multiple USB ports, but the updater still isn't registering my DDJ-SX as being connected.

Can someone please help.