Hi, I'm in a similar situation where the solution does not work. I found this phone in the alley, and replaced the badly cracked screen. Now I'm hoping to give the phone to my girlfriend, after getting it working. Cool looking around the guts of this phone, but now I'm stuck. This appears meant to prevent theft? Obviously, a thief will make up a cover story like the one above. Is there a way around this, or is this IMEI/MB locked out till I can supply the email address of the previous owner, who threw it away broken?
I've got the XT1776, have rebooted, then factory reset, but continue to get the "unknown error" message mentioned above regardless of whether I use the New setup or the Restore options at the google setup page ( after wifi).