I went through the whole song and dance. Initially it worked, banners were gone, ads didn't pre-roll. But recently the guide ribbons/banners came back. I'd guess the customer service folks are doing the best without being provided the tools they need, so whatever they're doing doesn't seem to be permanent. I also seem to have been unluckier than a lot of other folks here, so there's no real harm in trying. So far pre-roll ads are still gone, but what a mess. The ribbons are slightly less annoying if you disable channel logos completely. On one Bolt I gave up and downgraded to TE3. Bonus side effect: transfers work again, before nothing would ever happen when both devices were on TE4.