Why CDC Serial Device installation fails on Windows Vista and 7? Because of Microchip's INF file bug, you may succeed or fail on installation of CDC device driver to Vista and 7 boxes. Version of the stack and INF files with this problem Microchip Application Libraries v2010-02-09 (v2.6a) C: Microchip Solutions USB Device - CDC - Basic Demo inf mchpcdc.inf C: Microchip Solutions USB Device - CDC - Serial Emulator inf win2k_winxp mchpcdc.inf C: Microchip Solutions USB Device - Composite - MSD + CDC inf - Composite Device mchp-MSD+CDC.inf C: Microchip Solutions USB Tools USB CDC Serial Demo inf mchpcdc.inf Temporary workaround for Windows Vista and 7 Manually copy usbser.sys from an archive on your PC to drivers folder, if you fail to install. Free Download Samsung Mobile USB CDC Composite Device Driver 2.9.505.831 (Mobile Phones). ![]() These archive files open when you click it on an explorer window. ORIGINAL: chinzei b) Driver signing on 64bit Windows Above bug fix to INF file breaks driver signing of the installation package. Broken sign prevents us from installation and use on 64bit Windows, unless we apply test-mode power up. To complete the fix, we have to wait for Microchip until they get driver signing again. Is this true? I know the fix will break the WHQL. But usbser.sys supposedly is already digitally signed (KMCS, Kernel-Mode Code Signing) by Microsoft. So I assume you will get a warning, but you can still install the driver. It is similar to drivers using WinUSB. You can use your own INF file, the whole driver package has no WHQL, so you will receive a warning, but you can still install it.
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November 2018
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