I just bought a Code. I can connect via bluetooth however it won't download any patches because it says it's not connected even though it is. I bought the USB #2 cable (that doesn't come with the amp) and the amp still says it's not connected to my computer even though it is. Other modeling amps don't have this issue. Marshall, you REALLY dropped the ball on this amp.
Thank you for your comments, you cannot download from the My Marshall, you will need a mini USB, you will need to make sure the Mini USB is a data cable not a charging cable.
Just connected my Code25 last week on my computer under Linux Ubuntu. It works very well. You need to connect everything before you turn on the amp, then use Chrome and go on Presets on this website. Then Chrome will ask you to allow MIDI, just allow and you can access your amp and upload presets on it...
Hope this helps,