Geppetto
You have 1.0.00.180160 (where did you get it?) Firmware version which is not supported. (For 505s default action in this case was to also flash RootFS, but it's not available for PRS-300 in this installer, that's why it has failed).
Didn't installer warn you about "not supported firmware"?
You could try to do it via Advanced Settings => Flash PRS+ Firmware. but I cannot guarantee that it would work.
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