i had used STM32L151VCT6A MCU for a project i have already programmed by using st-link and tested its peripherals due to some issue on display i tried to reprogram it is not allowing to read or write it is showing an error as below attached, the programming pin i.e. data line is showing low i,e pin no 72 on controller. is this pin effecting the programming, if it is so what have to be done to this pin?
