If you didn't get rid of the cinch bugs, they'll just move on to the new sod and infest that. You can safely use diatomaceous earth on the dead spots, it's not toxic to mammals or birds, but it's deadly to insects and parasites. You just sprinkle a little bit of it (a few tablespoons per square foot) - on a day when it isn't expected to rain for at least 4 hours. Then repeat the process a week later, and then one week after that.
Then pull out all the dead grass, and add some seed or just let the grass work its way back into place (real grass needs seed. Bermuda grass needs nothing)
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