If you’re interested in creating a dual-boot environment on your Mac, check out these easy to follow tutorial that cover deploying Yosemite and El Capitan on a separate partition and USB flash drive: How to install OS X 10.10 Yosemite on a separate partition; How to install OS X 10.11 El Capitan on a separate partition. Download your copy of the prebuild (32-bit) version of boot.efi for El Capitan (compiled on Microsoft Windows 10 with Microsoft Visual Studio 2015) with a black background and white Apple logonow, and verify the download by entering (either one) in a terminal window: openssl md5 boot.efi = 036476dc081da904f50736eb56acbcfa. Now my bootloader is broken or corrupted and I cannot boot to El Capitan. The El Capitan installer is downloaded to the /Applications folder, with the file name Install OS X El Capitan. If you have already installed El Capitan and wish to now create a bootable installer, you can force the Mac App Store to re-download the installer.
Created a bootable USB with El Capitan installer
booted from it, erased my MBP (mid 2009), clean install from USB installer
decided to use migration assistant, most apps not working plus all the clutter from pre clean install
decided to do another clean install but MBP won't boot from USB and uses the recovery version instead.
tried to get Maverick back and basically ended up with a non-working MBP that went into a boot loop
did a reinstall from MAS, ended up DLing the entire Installer again, went to bed and in the morning and 'working'
MBP again, plus all the clutter and non working apps.
Made a new bootable USB key using terminal and yes it finished and yes it said bootable at the end as well as in Disk Utilities.
However when trying to boot from USB, start+Option, or start+cmd+r still no sign of the USB stick, which i guess would leave me
with a non clean install again.
Any help, suggestions.....?
Bootable El Capitan Download
Cheers
El Capitan Boot Menu
El Capitan Boot In Windows
Ralf
MacBook Pro (13-inch Mid 2009), OS X El Capitan (10.11)
El Capitan Boot Drive
Posted on Oct 4, 2015 7:57 AM