I've managed to install MacOS 12 on my X1 Yoga gen 2 via external ssd, did not went flawless, need to change AAPL,ig-platform-id = 0000C087 to 00001659 & SystemProductName = MacBookPro14,1 to MacBookPro14,2, old values works in Big Sur 11.5.
Wifi & BT is not working, did not try Heliport but will try ethernet once I got the chance.
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