How to set watchdog value for reconfiguration of MAX10?

I'm not sure if this enables the option, but you currently only have one .sof data page in the "Input files to convert" section. There's no reason to have a watchdog to switch to a different image if only one image is available. Try adding the second .sof page and see if that enables the option. You can also check out this training for more info on this:

https://www.intel.com/content/www/us/en/programmable/support/training/course/omaxrsu.html

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