Dunno why, but "adb reboot bootloader" gives me different Interface that You had... So it mans that my device may not have Fastboot access? Nooo ;(
Code:
Interface Descriptor:
bInterfaceNumber: 0x00
bAlternateSetting: 0x00
bNumEndpoints: 0x02
bInterfaceClass: 0xFF
bInterfaceSubClass: 0x06
bInterfaceProtocol: 0x05