The other daytime a cobalt - worker demand to adopt a Mac , so I grabbed an old MacBook Air from storage . I decided to wipe out the laptop computer ’s flash storage and set up a refreshful version of OS X. Icreated a bootable USB flash ride installer , plug it into the laptop computer , constrict the alternative key fruit as the car bring up , and then pick out the USB drive as the thrill disk .
I then ran Disk Utility to reformat the drive and then execute the installer to install OS X. It look like thing were moving along , until this appeared on the filmdom .
error notification while try on to establish OS X El Capitan from a USB installation disk .
erroneousness message while trying to install macOS Sierra from a USB installation disk .
I created another boot disk using a dissimilar depot drive , in suit it was a hardware problem , but I got the same error . I figured that the fact that the laptop computer had been in storage for a while had something to do with it , and it did .
Note : This fix should work with OS X Mavericks and El Capitan . It also worked for me with macOS Sierra , which show a different erroneousness message ( “ The installer payload failed signature check ” pops up near the ending of the installation ) than the one that look for El Capitan and Mavericks .
How to fix the problem
The installer checks the date on the computer . If the date is n’t current , you get the error above . The fix involves correcting the date on your Mac .
If you have an older OS on the Mac
If you have a sodding type O on the Mac already , boot into it . Fix the appointment in the Date & Time system preference ( orchard apple tree carte > System Preferences ) . Reboot using the USB boot disk , and you should be able to go on with the installation .
If you don’t have an OS on the Mac
If you are in a situation like I was , and you do n’t have a ended type O on your phonograph recording ( you reformatted it ) , you ’ll regain that there ’s no way to get to the Date & Time system of rules preference when you employ an external USB boot installer driving force . The Apple menu does n’t give you memory access to System Preferences . You have to use the Terminal to determine the date and time .
How to enter the Terminal when you boot from an outside boot drive installer .
If you use an external boot disk , you Mac start out up into OS X Disk Utilities . you may get to the Terminal by clicking on the Utilities bill of fare and selecting Terminal . Once the Terminal has launched , perform these actions .
Your Mac should now have the current particular date and clock time . If you enterdateagain ( as I did in the screenshot above ) the info that come out will be current . you could now melt the OS installer .
If you don’t have an internet connection
you could still practice Terminal to set the day of the month . Go into the Terminal as described above , then pursue these stride .
In my example , the numerical representation is 0719140016 . This stands for July ( 07 ) 19 , ( 19 ) , 2 p.m. ( 1400 ) , 2016 ( 16 ) .
The appointment should be set . you could insure the date again by typingdateat the prompt . you may now execute the installer .
