I have AT&T M8. Windows 8.1. When I connect phone with USB cable the MTP won't establish a secure connection so that phone shows attached to computer and I can explore files. The MTP files show as installed. I have HTC sync manager insatlled. But Media device (MTP) connected flashes non stop and computer keeps asking what to do with phone when connected. File explorer shows phone connected and then gone again in a couple of seconds.
Help please!
Help please!