Unfortunately this doesn't help if uiStateJSON is populated, as their solution was simply to "Edit this JSON file and remove all uiStateJSON elements from the JSON"
I am upgrading from 6.8.0 to 7.5.2 and the only error I get in the logs is
"FATAL Error: mapping set to strict, dynamic introduction of [uiStateJSON] within [dashboard] is not allowed"
We have thousands of dashboards, but we have things such as uiStateJSON set to: "uiStateJSON": "{\"P-1\":{\"vis\":{\"legendOpen\":false}},\"P-2\":{\"vis\":{\"legendOpen\":false}},\"P-5\":{\"vis\":{\"legendOpen\":false}},\"P-4\":{\"vis\":{\"legendOpen\":false}},\"P-6\":{\"vis\":{\"legendOpen\":false}}}",
or "uiStateJSON" : "{\"P-1\":{\"vis\":{\"colors\":{\"404\":\"#447EBC\",\"2xx\":\"#629E51\",\"3xx\":\"#CCA300\",\"5xx\":\"#C15C17\",\"Bad Request\":\"#447EBC\",\"Other 4xx\":\"#614D93\",\"Unauthorized\":\"#64B0C8\",\"status: 400\":\"#64B0C8\",\"status: 401\":\"#447EBC\",\"status: [200 TO 299]\":\"#508642\",\"status: [300 TO 399]\":\"#CCA300\",\"status: [402 TO 499]\":\"#2F575E\",\"status: [500 TO 599]\":\"#C15C17\"},\"legendOpen\":true}}}",
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