Testing required disabling Secure Boot and enabling test-signing mode. Windows 11’s Hypervisor-protected Code Integrity (HVCI) would block my driver unless it was compatible with Memory Integrity. I rewrote all pageable code sections to stay in non-paged pool. Finally, the driver loaded without triggering a BSOD.
Windows 11 had changed the game. Microsoft had tightened driver signing, deprecated legacy MTP class drivers, and pushed the Media Transfer Protocol v3 specification with stricter security requirements. My driver had to authenticate via the new Windows Driver Framework (WDF) and support both user-mode WpdFs and kernel-level WpdMtp stacks. mtp device driver windows 11
I started with the official Microsoft MTP driver sample. After installing my test-signed driver, Windows 11 threw a DRIVER_POWER_STATE_FAILURE within seconds. The problem: The new power management framework expected my driver to report device capabilities before the USB stack had even finished enumeration. A classic chicken-and-egg. Finally, the driver loaded without triggering a BSOD
I plugged the device into a clean Windows 11 VM with Secure Boot on. No test-signing mode. The driver, now properly signed with an EV certificate, installed silently. A notification popped up: “Device is ready. Open with File Explorer.” My driver had to authenticate via the new
I added a custom IOCTL for user-mode apps to trigger device resync. Wrote a small PowerShell script to fire it when Explorer stalled. The device appeared in “This PC” as a portable music player icon. Copying a 5GB video file worked—slowly, but without corruption.