Mac OS Repair Service 2 in 1 Bootable USB Flash Drive installer with El Capitan and High Sierra Fash drive USB 3.0 fast and efficient, you can reinstall fresh, wipe system, restore, upgrade
Works on Intel Macs with the OS requirements
INSTRUCTIONS:
1.Insert the flash drive2.restart computer upon restart before the chime hold down the option key (you might have to try a couple of times)this will take you to the booting screen3.using the cursor keys choose the operating system then hit enter4.once in the installer you can install from there by following on screen instructions