That's sad! Did you try a factory reset? Might work. You'll probably go back to 6 anyway which probably means that you have to flash the phome anyway (and reinstall everything).
Yes I tried a factory reset. That don't helped. Someone told me the not correct working WIFI is a problem connected to bluetooth which is always on hidden in this version, even when turned off. I don't know if its true but it sounds possible because there were always problems when wifi and bluetooth are activated both.
I will return to 20161011 in the next days and search for an other phone (with working Android 7 and with Galileo gps) in the next weeks.