ZTP and initial setup dialog

Hey,

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I'm playing around with ZTP on the CSR 1000v and it seems to only run when the initial setup dialog pops up.

The issue is I cant get the initial setup dialog to consistently pop up. It seems it only pops up the first time the router boots. Even with no startup configuration.

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Any tips on how to factory reset? Is there more to it than just write erase?

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Thanks :)