To enable dual boot on a T2 equipped Mac, one needs to change some Security settings first.

T2 Security Settings


BIAB 2025 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia/Tahoe, M1 MBAir, 2012 MBP
Digital Performer11, Logic, Finale27/Dorico/Encore/SmartScorePro/Notion6/Overture5