Official GB Update Working Now

The GTG Unbrick takes about 10 minutes... it's very simple.

Also, it is for sure due to the UCKH1 OTA from November. I was getting the same issues until I did GTG and then the update worked like magic, and I own a 64 bit Windows.

I was able to successfully update a UCKH1 phone without any fiddling around. This is in addition to another ECKE3 phone I did earlier today. One more (ECKE3 also) remaining, once the battery is fully charged.