If your last USB chip burned out, you mabe have an grounding/earthing issue. Is your PC on the same mains line? Or you try it with o notebook on battery supply, so you are ground free.
I haven’t tried it on a laptop did think about it but didnt have one to hand there is alot of ground points on the motherboard that arent connected to anything. And they are on the same mains power point could that effect the USB chip burning out?
Thanks to everyone that helped me with this I finally got it to connect to an old laptop and was able to update the firmware, i do have another problem with the extruder where it wont flow out which most other forums say its fown to the PTFE tube in the Hotend i was thinking about getting a All Metal Hotend as i heard good reviews on them anyone have one and got good prints with them? Cheers