I want to program STM32VL Discovery via USART1. I am using "Flash Loader Demonstrator V2.6". I have connected BOOT0 pin to 3V directly and BOOT1(PB.02) to GND. I have connected USART1 PA.09(Tx) to PC Rx and PA.10(Rx) to PC Tx directly. Problem is that the Flash Loader Demonstrator is unable to connect with STM after reset.I think STM enters into System booloader mode correctly but cannot communicate with PC. I have also tried to send 0x7F manually through hyper terminal but STM is not returning any response at all.. Note that I am using serial to USB converter and it is working fine. I have tried all baud rates with even parity,1 stop bit configuration. Secondly I do not understand if there is any need to use pull up resistors in circuit especially on USART pins. I am directly connecting the wires without pull up resistors. Please help to resolve bootloader issue. Thanks in advance.