Okay, if there's a button you have to hold to enable firmware update then it's more sensible. Probably still wouldn't want to use digital audio input though. A

Okay, if there's a button you have to hold to enable firmware update then it's more sensible. Probably still wouldn't want to use digital audio input though. Although it's a perfect digital stream, it's been processed in analog-like ways before it gets to the device - such as filtering and volume changes. So you'd still want to use a modem protocol over it.