Posted on March 25, 2018 at 01:05The same issue with Nucleo401 board, HSE is't installed on the board. Selecting HSI as an input for the main pll mux gives an error. 

Posted on September 09, 2017 at 01:27Since the eeprom is on the expansion board, the question about its necessity is automatically rising. Of course, this is a dev board and we can use or not the peripherals based on the application needs.Of course ...