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My Impressions of the MacBook Pro M4

(michael.stapelberg.ch)
240 points secure | 3 comments | 31 Oct 25 10:13 UTC | HN request time: 0s | source
1. jsomedon ◴[01 Nov 25 07:10 UTC] No.45779779[source]▶
Is it possible to install previous macOS version on newest macbook model? I see people having terrible experience with macOS Tahoe yet I am considering purchasing a macbook..
replies(1): >>45781017 #
2. inatreecrown2 ◴[01 Nov 25 12:06 UTC] No.45781017[source]▶
no this is not possible because apple stops signing older versions soon after they release the latest.
replies(1): >>45783034 #
3. wtallis ◴[01 Nov 25 16:35 UTC] No.45783034[source]▶
No, that's a separate issue. You can upgrade a M4 or earlier machine from 15.6 to 15.7 even today, despite 26.0 being out for a while, so Apple's still signing a 15.x release at the same time as they're offering 26.x releases. (You likely won't be able to downgrade from 15.7 back to 15.6.)

Downgrading a M5 machine to 15.x would be impossible not because of a signing issue but because Apple never released a 15.x build that supported M5 hardware.