I have updated the firmware a few times before, but now I can not get the boot disk to show up on my Mac.
I have tried with MacOS 12.2 and later with 12.4. I have tried with a direct cable to the usb-c port, and with an older cable via a hub that I am sure I have used before for this procedure.
No luck
What else can I try?
Maybe there is something wrong with the boot disk… I’ve noticed a few times that the synth didn’t give any sound after powering on (except for some zipping noises when turning the master volume), and I had to turn it off and on again for it to start working.
I have now also tried it on my Mac Mini, which still has a USB-A port. No luck there either.
It works now, after trying the 15th time, and now it keeps connecting also. Weird, but I’m glad it’s back 
I have some distant but very unpleasant memories 
The no sound on boot issue is a more general issue that is to do with FPGA not always initialising on boot, something UDO are aware of. So I dont think you need to worry about that being a symptom of a problem with your boot disk.
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I had this problem and tried a different USB C port on my Macbook Pro. That worked. I was using that port for my Studio Display.