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1) General consensus on the HID is it is more problematic than an upgrade.
2) Knocking noise needs to be identified before any more driving, codes from the USB port are going to help in tracking
3) in all likelihood it's normal unless it's related to the knocking noise
4) The least of your worries but sounds like a pia to fix, maybe the cpu was changed? Just a guess but on the "back burner" compared to the knocking.
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