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mbigras/Upgrade MacBook Air from Mac OS X 10.8.5 to Big Sur 11.7.2.txt

Created December 28, 2022 20:55
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Upgrade MacBook Air from Mac OS X 10.8.5 to Big Sur 11.7.2
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Upgrade MacBook Air from Mac OS X 10.8.5 to Big Sur 11.7.2.txt
# Upgrade MacBook Air from Mac OS X 10.8.5 to Big Sur 11.7.2
[Todo]: Add insights to https://www.reddit.com/r/MacOS/comments/r909mh/mountain_lion_to_big_sur/.
For portability, see https://gist.github.com/mbigras/1e4a230e93d7ea70efb9ae7b7c7b7ae1.
1. From another laptop, download the El Capitan installer.
2. Erase MacBook Air.
3. Copy El Capitan installer.
4. [Todo]: Add the Waterfox workaround.
1. Download the latest 5X.Y.Z Waterfox browser on a different machine.
https://cdn.waterfox.net/releases/osx64/installer/
2. Copy the Waterfox installer from your laptop to a flashdrive.
3. Copy from Waterfox installer from flashdrive to MacBook Air.
4. Install Waterfox browser.
5. Install Mac OS X El Capitan version 10.11 installer.
https://support.apple.com/en-gb/HT211683
6. Install El Capitan (with the installer).
7. Install macOS Big Sur version 11.
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