firmware CDR3 update.What kind of update are you doing? Is it an OS/firmware update or an app update?
I had the exact issue with my 928 yesterday. Tried everything possible, even reflashed using Navifirm, to Jo avail. I exchanged my 928 for a new one and that did the trick. Talk about weirdMy htc windows 8 phone download update but the message, the update was downloaded but could,nt be opened, (8007000d) .