You should start a different thread for these questions, but in short…
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YES, (I’m making the assumption you’re talking about 450b’s being used as an SM or BHS) you can (kind of) manually adjust the power on a 450b (depending on a few things). On SM’s you can set the SM to “Max TX power” and on BHS’s you can granularly control the TX power. If you’re using SM’s/BHS’s that are 3GHz/CBRS, then this complicates things slightly. All that aside, in almost all cases you’re better off letting the AP or BHM determine the SM’s power output via the AP/BHM’s “SM/BHS power control” feature, and…
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YES, as of firmware release R22, you can now update the firmware via the GUI.