TREZOR 1.4.0 fails on Windows about multibit-hardware

[jhoenicke]

The main difference of 1.4.0 is a second hid interface for u2f functionality. The first HID interface enumerated should be the usual Trezor link, the second interface is u2f. You have to make sure to send the commands to the first interface.

Preferred way to distinguish these is by the HID usage page: ff00 for Trezor and f1d0 for u2f. This is sometimes given when enumerating the interfaces, or you can query the report descriptor. You can also use the endpoint (1 vs 3), but boot loader uses different endpoint so this is not reliable.

[bgok]

@jhoenicke Thanks for explaining. That information will be very helping in getting 1.4.0 working.

[prusnak]

Windows (and OS X) HID drivers report usage_page, so that should be the preferred method. Only problem is in Linux/libusb where usage_page is empty and one has to use interface_number (which is empty on Windows/OS X).