Click on 'Security & Privacy' and then on the 'General' tab.From the Apple menu, open the System Preferences.Depending on what version of the operating system is on your computer, you may get a box popping up with a message stating that CrossPack-AVR 'Can’t be opened because it is from an unidentified developer.' If this happens follow these steps.

Double click on it to open the disk image and double click on the 'CrossPack-AVR.pkg' file and follow the instructions to install the cross compiler software. Obtain the file 'CrossPack-AVR-20131216.dmg' or a more recent one. The avr-gcc software can be downloaded from.When you use Apple Diagnostics to test your Mac, the test results include one or more reference codes.To install the avr-gcc software on a Mac running macOS 10.14 or earlier: When you're done, choose Restart or Shut Down from the Apple menu. Your Mac will restart to a webpage with more information. To get information about your service and support options, make sure that your Mac is connected to the internet, then click ”Get started” or press Command-G. To shut down, click Shut Down or press S. To restart your Mac, click Restart or press R.

To repeat the test, click “Run the test again” or press Command-R. When testing is complete, Apple Diagnostics shows the results, including one or more reference codes: View the test resultsĪpple Diagnostics shows a progress bar while it's checking your Mac: You can use the Wi-Fi Menu in the upper-right corner of your screen to choose a Wi-Fi network. You may be asked to choose a language and make sure that you have an active network connection.

If neither method works, review the guidelines for using key combinations at startup. If using the D key doesn't work, press and hold Option (⌥)-D at startup instead. Release when you see a progress bar or you're asked to choose a language. Turn on your Mac, then immediately press and hold the D key on your keyboard as your Mac starts up.

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