If you sold it for less than what you paid for it, then it will be a capital loss.
The best way to report this would be to "capitalize it" (as @DavidD66 stated). Enter it in the Business Asset interview of TurboTax Self-Employed (or Home and Business) and indicate that you stopped using it in August 2020. Any loss on the disposition would be a short-term (ordinary) loss.
