You need to power down the phone and the turn it back on after that. Then it shows up. Also for anybody having trouble getting this update, I went through the following to get it: numerous calls to ATT, found out my new Inspire was using the old phone's 3G SIM card and not a new 4G SIM, was told it was not registering properly on ATT network, then told to go get new SIM, got new 4G SIM, phone still did not register properly, then told that IMEI # was not setup correctly when I purchased the phone and could not be verified properly and they needed it from the phone to reverify. Two days later I called back, now phone registered properly, they could push the update. I got the " Complete Setup Yes or No" message. Then I had to turn off the phone and turn it back on. Then I had Unknown Source options in the application tab. Hope this helps someone.