Code 52 means "unsigned driver." You must disable Driver Signature Enforcement (see Step 2 in Part 2) permanently or use the Generic USB Audio driver.
Even with the drivers installed, Windows 11 can be finicky with legacy audio hardware. Here are two common fixes:
Modern versions of Windows 11 require all kernel-mode drivers to be digitally signed by Microsoft. The original MobilePre drivers (versions 1.0.0.3 and earlier) lack this modern signature. Consequently, when you plug in the device, Windows 11 either: M-audio Mobilepre Usb Driver Windows 11
Let’s be realistic. The M-Audio MobilePre is over 15 years old. Windows 11 has deprecated significant portions of the legacy USB audio stack. If you absolutely rely on this interface for daily work and cannot afford a new interface, consider these extreme measures:
If official drivers fail consistently, use ASIO4ALL: Code 52 means "unsigned driver
This provides basic input/output but without the MobilePre’s hardware monitoring.
Best for: Podcasters or streamers using VoiceMeeter or OBS. Not ideal for professional music production. Best for: Podcasters or streamers using VoiceMeeter or OBS
To solve a problem, you must understand it. The M-Audio MobilePre USB uses a specific communication protocol that was standard in the early 2000s. Windows 10 and 11 have significantly changed their driver signing requirements and audio stack architecture.