![]() I selected the one named macOS Installer:ġ1) Now that the arrow was pointing to macOS Installer, I clicked it to finish the probably failed or interrupted macOS update process.ġ2) The installer showed me that it was calculating how much time it estimated updating would take. I used the Startup Manager as described above (and at the link), holding the option key down as soon as I heard the Apple chime.ġ0) Remember to give the Startup Manager enough time to scan for and show all your connected bootable drives.ġ1) When it was time for me to pick a boot partition/drive, I did not select the one with macOS Mojave 10.14 beta 4 installed. I pressed the power button until my MacBook Pro powered down.ĩ) I pressed the power button and my MacBook Pro powered on. I clicked the Install Now button (highlighted in red):Ĥ) I was prompted with a dialog which informed me that “To update, you must restart your Mac.” I clicked the Restart button (highlighted in red):ĥ) My MacBook Pro restarted and then showed me the generic Apple progress bar:Ħ) I patiently waited… UNTIL I GOT THE DREADED … prohibitory symbol:ħ) Instead of panicking, restoring from backup, reverting OS version, running diagnostics, etc., I trusted my instincts. I clicked the Update Now button (highlighted in red):ģ) I was prompted with an informative confirmation screen. I then clicked on Software Update… (highlighted in red):Ģ) The Software Update window opened and informed me that “macOS Mojave Developer Beta 8” was available. The About This Mac window opened with the Overview tab highlighted. Here’s what happened:ġ) I initiated the update process by going to the Apple menu and selecting About This Mac. Earlier today, I decided it was time for me to be running the latest version of Mojave beta. I had been promoted several times by Mojave to update, but ignored those prompts for severals weeks. I had heard that Apple had released versions of Mojave newer than the one I initially installed. Prohibitory symbol displayed when updating from macOS Mojave 10.14 beta 4 to macOS Mojave 10.14 beta 8 Perhaps there was a glitch while my Mac was initially looking for a bootable drive. Always be patient so that the Startup Manager has time to scan for all connected drives and display them on screen. IMPORTANT: When you first see your bootable devices show up, you may not see all of them immediately. If you press and hold the Control key during this step, your selection is saved in Startup Disk preferences, so it persists until you change it.
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