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I seem to remember there being a tiny recovery partition or cut-down version of macos or something maybe from boot CD (we have an old iMac).

Also found this:

https://apple.stackexchange.com/questions/311947/how-to-upda...

Still I'd rather have no MacOS.

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There is a recovery partition (in fact, it's used when installing Asahi) but I don't think it's possible to update the firmware from there. Boot CD might work. You could try asking on r/AsahiLinux.

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