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Originally Posted by macsek
Great news!
How can one tell if a version like 5.10.1.3 is a factory image or it was already updated to the same end user version?
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No guarantee but serial number (characters 9-12) is likely a good indicator (see batch numbers in earlier posts).
Mind, I don’t think untouched vs OTA matters as long as you have PW4 5.10.1.3 or older. The PW3 5.9.6.1 factory firmware worked for both brand new PW3 and OTA-updated ones. Some firmware versions even required an update to OTA 5.9.6.1 before the factory firmware could be installed. I expect it’ll probably be the same scenario here.