Wont boot from El Capitan USB, wont Reinstall El Capitan in Recovery
recognizes usb in disk ut. wont in disk chooser.
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How you created the drive is likely why it’s not working as a bootable drive.
- The drive need to be formatted by a Mac to be GUID and formatted with a journaled file system (HPFS+ here)
- The OS installer file needs to be copied to the drive, then converted into a boot image.
To add confusion to this Apple uses a certificate system to protect the integrity of the file. The age of the file you are using may have an expired certificate so it won’t work correctly. Down load a newer one from here How to download and install macOS and follow this guide to make it bootable Create a bootable installer for macOS
I recommend using a 32GB thumb drive as the most effective as the OS needs some space. And make sure you are using the correct OS release the system can support otherwise you need a cheat to allow the newer OS to work using a Shim service which translates the newer OS calls to the ones the system uses. There are limits here as the OS and Apps may need an API that not translatable.
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Remember to also set the time and date via terminal to something like 0101101010 otherwise it may fail due to an expired certificate or whatever.... a 16 GB drive is enough, I have a multi installer drive with every OS installer on it and its size for EL cap is 6.4 GB and it works fine.
@livfe - Using the newer installers which have an updated cert removes tha issue.
The size of the USB drive can e as little as 8GB in these older OS installers. But the speed of loading becomes dog slow! 32GB is the ideal size and is needed for newer OS releases if you reuse the drive.
@danj It is slow indeed because older systems have USB 1..0 or 2.0. Newer systems of course have USB 3.0 speeds. I use my installer driver almost everyday and it is wonderful. I would gladly make you one for you to use yourself :)
@livfe - I’ve got plenty of thumb drives already set up. The issue is the way the OS uses virtual RAM space, the Given systems USB port speed also affects the performance. But if you have a 3.x port you’ll see the size of the drive matters.
BTW - This system Is a USB 2.0 spec’ed port
@danj I use an external SSD as USB is a thing of the past.... ;)
What MacBook air is this 2008 or 2009?
Only 2009 models can support El Capitan
https://everymac.com/systems/apple/macbo...
2008 supports Lion.
https://everymac.com/systems/apple/macbo...
- de livfe
late 2008, a1304
- de Michael J
@livfe LATE 08, WHEN i got it it was on 10.11
- de Michael J