I didn't know 21.5' is not user upgradable. Only 27 https://support.apple.com/guide/imac/install-memory-in-your-27-inch-imac-apdd768f6349/mac https://support.ap

I didn't know 21.5' is not user upgradable. Only 27 https://support.apple.com/guide/imac/install-memory-in-your-27-inch-imac-apdd768f6349/mac https://support.apple.com/guide/imac/install-memory-in-your-...