Download: OS X El Capitan This downloads as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. The El Capitan DMG installer file, now available for download under the version of 10.11.6 for Mac OSX. Now the dmg file can be downloaded by any Mac device users. The Dmg file is known as the latest ISO regarding El Capitan operating system. When talking about the El Capitan OS X, this is the advanced OS, which has been released for the Mac. Finally, after about 25 more minutes, OS X El Capitan should be successfully installed on the target drive. Boot into El Capitan via the USB Device. After the second reboot, boot from the USB device once again, but this time, select Boot OS X from El Capitan, and select verbose mode. Press Enter and cross your fingers again. If all goes well. I have decided to go with a fresh and clean install of OS X 10.11 El Capitan this time. As I've done a thousand times before I created an install-USB by downloading El Capitan from the App Store and compiled it on to the USB-drive by using Apples own terminal command.
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Summary
How to make a bootable USB drive on Linux Mint (19.3) to allow you to install Mac OS X El Capitan on a MacBook with broken or corrupted recovery mode.
Background
I was recently given a 2011 MacBook Pro that had been “well-loved” and was therefore a mess of missing applications, ghost files and generally slow-as-hell. Since there wasn’t much worth saving I wiped it and initiated recovery mode in order to re-install OS X (El Capitan).
Having recently fixed a busted MacBook Air I had learned a bit about Recovery Mode (hold Command+R whilst pushing the Power button and release a few seconds after the machine wakes up). I tried that with this machine, and upon hitting “Reinstall MacOS X” was greeted with a prompt telling me it would take -2,148,456,222 days and 8 hours (an uncaught buffer overflow, me thinks). After about 30 seconds, a window pops up saying “Can’t download the additional components needed to install Mac OS X” and the installation gives up. The detailed error log says “Chunk validation failed, retrying” about 1000 times and eventually gives up altogether.
Further investigation suggests this may be something to do with security certificates having expired and hence the machine not being able to download the necessary files from Apple’s servers, but it seems the error can appear for all sorts of reasons. I also tried Internet Recovery (Command+Option+R) but that gave exactly the same error (and would also only have installed OS X Mountain Lion).
I then turned to attempting to make a bootable USB stick of OS X El Capitan from an image downloaded from Apple. I use Linux Mint on my main laptop and that was all I had available. Apple seem to assume everybody has a spare MacBook from which to create a bootable USB so they provide absolutely no documentation to help with this. I also couldn’t find a single guide online that worked from start to finish, so here I summarise what needs to be done.
Steps
As usual, this is all at your own risk 🙂
First you need to go to Apple’s OS Download Page and (step 4) get ahold of “InstallMacOSX.dmg” for El-Capitan. It’s a 6GB file so it might take a ‘lil while. You will also need to find a USB drive with at least 8GB capacity, and make sure it’s blank. The format doesn’t matter, because this procedure will format it correctly.
(In total you will need to use about 15-18GB of disk space by the time you’ve done all the extracting necessary, which shouldn’t be a problem for most computers but it was a challenge for my laptop with it’s 128GB SSD and dual boot Windows/Linux!)
Then you need to get a program called ‘dmg2img’
You can then extract the DMG
Now double click the .img file to mount it. In there is a InstallMaxOSX.pkg file. This requires a utility called “xar” to extract, which can be installed with these instructions (from https://www.oueta.com/linux/extract-pkg-and-mpkg-files-with-xar-on-linux/)
Then build and install with
Now you can extract the .pkg file. It will extract to the current working directory
Now, within the extracted files you will find something called InstallESD.dmg. This actually contains all the interesting boot files, but it isn’t a pristine image, so we can’t just burn it to a USB. Thankfully, a script exists to convert this DMG to a bootable usb, and it’s available here. It takes the DMG and writes everything directly to the USB in the right place.
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ONE CAVEAT: When I ran this script on my InstallESD.dmg, it crashed because it didn’t recognise the checksum. I think this is because Apple updates the dmg’s anytime there is a security update for El Capitan so the checksum list isn’t updated. All I did was delete the checksum check from the script above. Essentially, just open the script and delete this section
Once I had done this, I ran the script with my USB connected (/dev/sdb for me, but CHECK YOURSELF with fdisk or similar) and after quite a while it finished copying.
I plugged the USB into the MacBook, and opened the startup menu by holding down Option whilst pushing the power button. This gave me the choice of booting from EFI, or choosing a WiFi network. Click on the EFI, and then follow the prompts to install OS X from the USB drive!
When you’re done, you may need to use Parted or a similar utility to re-format your USB as a normal drive again.
Download El Capitan
Download El Capitan OS X is also significant since it’s the last version of Apple Mac OS X released as its successor Sierra was released in the year 2016 under the brand macOS.
El Capitan latest version
El Capitan 10.11.6 is now released as the latest version of Download El Capitan . For OS X El Capitan users this update is recommended. The upgrade to OS X El Capitan v10.11.6 enhances your Mac's reliability, performance and protection and is advised for all users. Solves a problem that can prevent parental control accounts from saving settings. El Capitan Download latest version solves an issue, which prevents access to SMB sharing points by some network devices, such as speakers and multifunction printers. It improves startup time for the NetBoot server connection. Solves a problem that can make authentication of Active Directory longer than anticipated.
At the time of release, El Capitan was promoted as a significant release by Apple similar to how they promoted Mavericks and Yosemite upgrades which were the predecessors of El Capitan.
OS X 10.11 El Capitán
This update is recommended for all OS X El Capitan users.
The OS X El Capitan v10.11.6 update improves the stability, compatibility and security of your Mac and is recommended for all users.
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This update:
- Fixes an issue that prevents parental controls from saving settings in enabled accounts.
- Fixes an issue that prevents some network devices, such as speakers and multifunction printers, from accessing SMB partitions.
Enterprise Content:
- Improves boot time when connected to a NetBoot server.
- Fixes an issue with a netboot image created with OS X v10.11.4 or OS X v10.11.5 installer preventing it from booting.
- Active directory authentication fixes an issue that may take longer than expected.
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System and Hardware Requirements for Download El Capitan
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- System requirements : You should have OS X v10.6.8 or below version and 2GB memory. And should have 8.8 GB of capacity. Apple ID is required for certain features; terms are applicable. Certain features include an Internet service provider that is compatible; fees can apply.
- Hardware requirements : MacBook (early 2015)/ MacBook (late 2008 Aluminum or early 2009 or newer)/ MacBook Pro (Mid or late 2007 or newer)/ MacBook Air (late 2008 or newer)/ Mac mini (early 2009 or newer)/ iMac (mid 2007 or newer)/ Mac Pro (early 2008 or newer)/ Xserve (early 2009).
Features of OS X 10.11 Download
- Safari has new features in the El Capitan update. It allows you to easily pin the tabs in the browser to the tab bar so that you can easily access them in the next time
- It has multi-touch gestures to applications like Mail and Messages. And it uses the gathered information of the individual emails on the apps like Calendar
- The Maps feature in the OS X 10.11 offers you the information about public transportation
- Notes feature has added more powerful text processing capabilities. Under this improvement, you can add to-do-lists just like the Reminders application, map locations, photos and videos, inline webpage previews, digital sketches, and other media types
- The Spotlight feature is more improved with more contextual information
- The Photos feature in the El Capitan can now use editing tools from other apps
- The System Integrity Protection gives you more protection to the OS X El Capitan running Mac computers and laptops