Question About Exchanging Phone With 8.1

[garak0410]

My ICON seems to have some unusual battery drain before and after 8.1 However, with the Dev. Preview, I am afraid I may not be able to exchange the phone before my 30 days are up. I am sure when they go to recondition it, they will see 8.1 and may void my exchange. Is that pretty much what may happen?

Thanks...