macUSB is a one-click tool that transforms your modern Mac (Apple Silicon) into a service machine capable of reviving older Apple computers.

With Apple's transition to its own silicon (M1, M2, M3...), preparing installation media for older Intel-based computers has become a challenge. Many people encounter Terminal errors, issues with expired certificates in old installers, or simply a lack of compatibility with system tools.

macUSB solves this problem.

The application automates the entire process of creating a bootable USB drive. You don't need to search for commands online, worry about disk formatting, or manually fix validation errors in old installation files.

• Legacy Support: The ability to create installers for systems over a decade old (e.g., OS X Lion) directly on the latest Mac on Apple Silicon.
• Time Saving: The app detects the system version in the .dmg or .app file, formats the drive, and copies files automatically.
• Auto Fixes: For certain older systems (e.g., High Sierra/Mojave), the app automatically applies necessary fixes so the installer works despite expired Apple certificates.

Fun Fact: The application was created using the "Vibe Coding" method in collaboration with the Gemini 3 Pro and GPT-5 AI models. The project proves that programming barriers (even cross-architectural ones) can be overcome with determination and AI support.

The application is an open-source project and does not possess a paid Apple Developer signature, so Gatekeeper will block it by default.

How to run the app for the first time:

1. Try to open the app – you will see an "Unknown Developer" message.
2. Go to System Settings -> Privacy & Security.
3. Scroll down to the Security section and click the "Open Anyway" button next to macUSB.
4. When writing the system to the flash drive, a system prompt asking for access to removable volumes will appear. You must Allow this so the application can format and write the system to the USB.

• Processor: Both Apple Silicon (M1/M2/M3, etc.) and Intel are supported.
• System: macOS Sonoma 14.6 or newer.
• Storage: Minimum of 15 GB of free disk space is required to create the installers.

• Capacity: Minimum of 16 GB is required.
• Recommendation: USB 3.0 or newer is highly recommended for faster installation times.

The program supports both .dmg disk images and raw .app installer files.

💡 Pro Tip: The best way to obtain valid files is the free application MIST by ninxsoft. Simply select the system version you are interested in. This guarantees the correct file structure/source.

The table below shows systems that have successfully passed tests for creating a bootable USB media using this application. (Status "YES" / ✅ means the app can correctly create a USB drive with this system).

During testing, compatibility issues were identified with certain system versions on Apple Silicon architecture. To ensure the proper functioning of the application and the system, macUSB intentionally restricts the selection of the following versions:

• macOS Sierra (10.12): Support is available exclusively for version 10.12.6 (the latest available update). Other releases of Sierra are restricted as they may cause issues and complications regarding the application's performance and system stability.
• OS X Mavericks (10.9): The installer file is incorrectly verified by the system as "damaged," preventing the procedure from starting.

If a .dmg image or a .app installer with Mavericks (or Sierra older than 10.12.6) is selected, macUSB will display an unsupported message and will not allow you to proceed to the next step.

The application interface automatically adapts to the system language:

• 🇵🇱 Polish (PL)
• 🇺🇸 English (EN)
• 🇩🇪 German (DE)
• 🇯🇵 Japanese (JA)
• 🇫🇷 French (FR)
• 🇪🇸 Spanish (ES)
• 🇧🇷 Portuguese (PT-BR)
• 🇨🇳 Simplified Chinese (ZH-Hans)
• 🇷🇺 Russian (RU)

This project is licensed under the MIT License.

This means you are free to use, copy, modify, and distribute this code, provided you keep the author information. The software is provided "as is", without warranty of any kind.

Copyright © 2025 Kruszoneq

Note: The application interface and this README file were translated using Gemini 3 Pro. Please excuse any potential translation errors.