I tryed to upgrade Netduino to firmware 4.2 and after loading bootloader and ER_CONFIG and ER_FLASH I cann't see Netduino via VisualStudio or MFDeploy but I see Netduino in device manger as USB device. When I return Netduino to firmware 4.1.0.6 everything is ok but I cann't deploy the project using VisualStudio:
"Error 1 Cannot deploy the base assembly 'mscorlib', or any of his satellite assemblies, to device - USB:Netduino twice. Assembly 'mscorlib' on the device has version 4.1.2821.0, while the program is trying to deploy version 4.2.0.0"