Hmm OK, with P1R17B03, the screen flashes all dark but then goes through the normal PUST and a key held error. Invoking FCC menu still produces an invalid tone. But the fact that the screen flashed all dark briefly with this key combination possibly shows something different about the power up config. I'll have to experiment a bit more.
I note the emergency button and top side button held together, as well as M and a few other buttons do the same dark screen flash too... hmmm.
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