crwdns2934241:0crwdne2934241:0 Dan

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The highest this series supports is El Capitan OS-X 10.11.6

You can download it from here: [https://support.apple.com/en-us/HT211683|How to get old versions of macOS]

You will need to use a second Mac to create a bootable OS installer CD or a FireWire drive. Its been awhile I don't think this series supported USB booting.

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open