Several months ago, I followed the process many on these forums did of developer unlocking my Nokia Lumia 920 via the Canada Rogers ROM. For a while it was great, but I would like to now return it to the AT&T ROM, as all the updates I believe are caught up. Some of my apps, including some Nokia ones, seem to not play well with this developer ROM, and my WiFi is hit or miss at home now, possibly due to this ROM. Is there any way to un-developer unlock my phone?