A colleague needed to borrow a Mac the other day, so I took an old MacBook Air from memory. I decided to wipe the laptop flash memory and install a new version of OS X. I created a bootable USB flash drive installer, plugged it into the laptop, pressed the Option key when the machine started, then I selected the USB drive as the startup disk.
So I ran Disk Utility to reformat the drive and then ran the installer to install OS X. It seemed like things were going on, until it showed up on the screen.
Error message when trying to install OS X El Capitan from a USB installation disc.
Error message when trying to install macOS Sierra from a USB installation disc.
I created another boot disk using a different storage drive, in case it was a hardware problem, but got the same error. I figured the fact that the laptop had been stored for a while had something to do with this, and it did.
Note: This fix should work …
- According to this source MacOS or OS X installation: what to do when “the installer payload signature check failed” or “this copy of the OS X installer application cannot be verified”
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