I struggled with this problem for a while that my DNA droid would not be recognized by Android Studio. Initially, I thought it was related to drivers - it was also HTC Manager. I received this update successfully. Nothing yet. Then the windows did not recognize the actual device in the device manager and did not perform the update.
Then I realized that the usb port that I used was not compatible with the usb cord that I used to update for USB Mass Storage. I moved the usb ports and restarted the update for windows drivers. No adb detected yet. Did more digging and found a great step-by-step fix. The latest version of the software for my DNA phone has been completely removed and hid the developer settings in the settings. Verizon help resources had a fix. My phone was not configured to run usb debugging (it has nothing to do with going through the Internet through the settings, which, as I thought, were replacing the developer settings for an hour or more).
Briefly do this (these elements look interactive and usually do nothing, except in this case) in the settings - About the program - Information about the software - Additionally - Press the build number 7 times. You will begin to receive a Toast message about becoming a developer. After you return to the main settings, the developer options are now visible and accessible.
Hope this helps and saves the other 4 hours I spent on it. Applications are now installed for debugging on my device.
The fix is here on the verizons website: http://www.verizonwireless.com/support/devices/knowledge_base.html/70154