You have tried these older ones right? And plugging into each of the two sides.
Be very sure that you have a working and good condition data transferring cable because I once tried 6 different usb cables that all had the correct number of wires and pins without any working and buying a new one on Amazon fixed it.
Make sure to plug everything else out of the top of the vesc and give it a reasonable voltage. I found in the past mine could have just the bare minimum voltage and light up but not connect, then connect when I turned up the psu so just try be between 20v and 60v.
If you want to give Bluetooth another try, clicking a momentary power button 3 times will connect the internal BT module to ESCA, 4 times for ESCB, and 5 times will make it disconnected from both. If you own another BT module then plugging it in is worth a try