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Stm32f105 don't enter dfu mode

Question asked by issa.hisham on Nov 5, 2012
Latest reply on Nov 7, 2012 by issa.hisham

I designed a board which contains stm32f105 microcontroller, and i want to use DFU as bootloader in order to download my program to the micro controller through usb port.
I put BOOT0 =1, and BOOT1=0
then i powered the circuit and connected it to usb port of my pc which runs windows xp.
But the pc didn't recognise a new device.
These are the processor data:
VCT6        Z
990TD   93
MYS 99 045

First question: Why the pc didn't recognize a new device?
Second question: the date code is 045 what year does this mean?