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The grey out is a normal behavior of the app after clicking the Download button (indicates that, you cannot operate the app until the flashing process finished) but then you have to connect your powered off phone to USB.
I couldn't test it with Rome X but if connecting your phone this way is ineffective, you can try to press and keep pressed the power button (for about 10 seconds) until the flashing process starts. Then you may release the power button and must wait for the finishing of the flashing.
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