L Supreme --

My last phone got stuck in that "clearing data...." mode a little while back after a soft reset. I couldn't even get it past it for hard resets. Don't know what happened. (It was before the 6.1 upgrade, so certainly unrelated). No one including VZQ knew what was wrong or how to fix, so they had to overnight me a refurb. Hope it is not the same problem for you, but I found no solution.