ULi M920x firmware
You can get it either with usbsnoop or snoopypro under Windows. See http://www.linuxtv.org/pipermail/linux-dvb/2006-November/014682.html if you want to use usbmon with vmware player.
Firmware will be sent as soon as you plug in the device, so you should not start any programs. Sticks with remote controller might have program called Uremote.exe (or similar) running. If you do, please shut it down so that it doesn't cause traffic in logs.
m920x firmware consists of a number of 64 byte long usb control messages. After these control messages you will see another control message with request, value, index of M9206_CORE(0x22), 0x01, M9206_FW_GO(0xff69), respectively.
After usb device receives this message, it will disconnect itself from the bus and appear again with (possibly) different idVendor and idProduct. These new ids are known as warm ids. At very least you will see your device having new endpoints that will be used to transmit data.
It's important to have Usbsnoop or Snoopypro installed and logging before you plug in the device. It might take several attempts to get a dump where this firmware is visible.
After acquiring a log with firmware, you will need to process it with various tools.
First with parser.pl and then with m920x_parse (arguments -i us -m fw)
m920x_parse (arguments -i um -m fw)
m920x_sp_firmware can only read data in this format: http://www.roback.cc/projects/iRiver/howto/snoopypro/wordpad_saved.png