Does STM32 bootloader contains USB DFU?
Does STM32 bootloader contains USB DFU?


Depends on the specific part. Refer to the part datasheet, or see AN2606 for a comprehensive overview.

For STM32F2 parts, it depends on the revision of the part. New parts (revisions X and Y) support USB DFU, but some older parts (revision B) do not.