Windows handles partitions differently than macOS, so formatting requires precision.

Disable Secure Boot, Fast Boot, and VT-d. Enable AHCI and UEFI mode. Booting: Select the USB from your BIOS boot menu.

Select "Install macOS." Because the files are already on the USB, the "Time Remaining" bar will progress steadily without relying on your Wi-Fi speed.

Navigate to the Utilities/macrecovery/ folder inside your downloaded OpenCore package. Open a Command Prompt in that folder.

Most OpenCore guides suggest a "web recovery" method. This downloads only a few hundred megabytes to the USB, requiring the actual macOS installer (12GB+) to download during the boot process. An offline installer includes the full BaseSystem or install app, making the process faster and more reliable. Phase 1: Prerequisites Before starting, gather these essential tools: High-quality USB 3.0 is preferred.

Every offline installer needs these basic "Kernel Extensions" in the EFI/OC/Kexts folder: The "arbitrator" for many other kexts. VirtualSMC: Emulates the Apple SMC chip. WhateverGreen: Fixes graphics issues.

Installed on your Windows machine (ensure "Add to PATH" is checked).

This will download the BaseSystem.dmg and BaseSystem.chunklist files. Phase 3: Preparing the USB Drive

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