I'm not sure that what you want is USB remote features... ....why is it very important for you?! ...if can i ask.
but it seems it doesn't have implemented yet to a550.. or I'm wrong?
If the camera doesn't support to send a live stream over usb, then a canon firmware part is missing and it is NOT possible to get it running without of much lowlevel work in camera frimware, maybe it would also be necessary to change/rewrite the Firmware.
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