How to Solve macOS Sierra Update Problem on your Mac ?Apple has recently released macOS Sierra for OS X 10.11 El Capitan users with significant updates and bug fixes across the board. Though, the new package comes with great features but also have handful of problems like Wi-Fi connectivity issue and unexpected errors.At this stage you need to call at Apple help number 1-877-232-0717 and allow a remote session on your Mac to find the data safely.http://www.mactechnicalsupportphonenumber.com/blog/how-to-solve-macos-sierra-update-problem-on-your-mac/