Have a Roamio on TE3. If I do a CDE will the Roamio still be on TE3? If I put in a new drive and let the Roamio format it will it format it to TE3 since the last drive in there was TE3 or would it format to TE4 since a blank drive? Kind of a flash drive issue I think, hoping since the current drive is on TE3 the flash drive is also on TE3 if that makes sense. I value all feedback but of course prefer someone who has actually done either/or, preferably the new HD. I do want to avoid TE4 even temporarily though I could probably roll it back. I'd rather make sure the Tivo stays on TE3 with either the CDE or better yet the fresh drive (actual fresh drive, no copy/clone/backup/restore). Hmm, if doing the new drive maybe let it format without being connected to the internet? I doubt it could switch to TE4 if not connected, would have to stick with what is currently on the flash drive? Though would have to be connected for guided setup.