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as far as I know there is no ICNR in 350D even if you install russian firmware. I believe this function isn't available in 300D/350D/400D/450D models.
re mirror lookup, I am not quite sure either. I used it a couple of times in my 300D but gave up as I could see any advantages when it's used with slow scope imaging DSOs.
I guess a mirror lock up is a part of a camera operation and you cannot control it via software or remote. If you install this firmware you'll be able turn mirror lockup on in your camera settings and use it. The only thing I think software can do in regards to mirror lock up is to set some delay which gives a camera some time to get mirror up before it opens a shutter.
cheers,
Mike
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