eBay has not added the new USPS service to their API yet, so we can’t yet release a new version of SixBit until they do. That version should be released this week when the new Ground Advantage service is active in the eBay API. It should be version **4.00.536** or later.
If you are using our presets, you’ll have to upgrade to the latest beta version of SixBit when it’s released. At that point, you’d then be able to edit your named presets and revise the running listings using them. If you’re using Manual presets, you will need to update those as well with the new service.
Version 4.00.536 will be out today to show the Ground Advantage service. The current version does support Ground Advantage by selecting the Parcel Select service. Ebay changed the Display name from Parcel Select to Ground Advantage, but the service ID we send is the same. So if you list with that, it should be showing on site as Ground Advantage.