Hi,
I had the same problem. This is what I did:
Get a computer running Windows XP 32b or run it in a VM. I used VirtualBox in my Win8 host machine
Install USBDM software:
1) http://sourceforge.net/projects/usbdm/files/Version%204.10.6/Software/USBDM_4_10_6_120b_Win.msi/down...
and the driver for your WinXP machine
2) http://sourceforge.net/projects/usbdm/files/Version%204.10.6/Software/USBDM_Drivers_1_2_0_WinXP_x32....
Connect the USBDM and install drivers automatically, depending on the FW version of your USBDM it will tell you "bdm firmware version is incompatible" when trying to connect. If this is the case, run "USBDM Firmware Updater" which was installed with 1). Device will be updated.
After you have successfully update your firmware in WinXP. You can now switch to your Win8 machine. Download Zadig and install it in your Win8 machine:
Zadig - USB driver installation made easy
Open notepad, paste the following lines and save it as "USBDM.cfg"
--start //dont copy this line
[device]
Description = "USBDM"
VID = 0x16D0
PID = 0x0567
GUID = "{93FEBD51-6000-4E7E-A20E-A80FC78C7EA1}"
--end
Connect the USBDM, open Zadig, load the USBDM.cfg file, select WinUSB and install the driver. This should install the signed driver and let you work under Win8
Regards!