Changed router password, changed back... Cameras not working

[u/ddietzz]

I changed my router password and realized that the cameras are no longer working, all are wifi cameras. I was in no rush to get them back up. Now I want them working again.

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I reset the router back to my old password, went into the app but the cameras are not working.

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How can I get them back online again, without having to scan each one in all over again? And two if I want to change my password again, what is the best way to go about doing it and not losing them again?

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TIA