ZFlasher STM32 is a program for flashing STM32 microcontrollers. Your device must have support USB Host (OTG), otherwise the program will not work. Supported STM32 family: STM32F05x / F03x / F04x / F07x / F09x. Stm32f1 ld/md/hd/xld/cl/md vl/hd vl. STM32F2xx. STM32F301x / F302x / F303x / F318xx / F328xx / F334xx / F398xx.