A new MIOS32 Bootloader release v1.010 is available which finally solves the USB MIDI issues under Windows by enabling the usage of the GM5 device driver. -> http://www.ucapps.de/mios32_download.html Unfortuntely this change means, that Bootloader and Applikation have to be updated. Old application releases are not fully compatible anymore (the new bootloader can't be accessed from the old releases), therefore a cumbersome update procedure is required which is described below. I must say