Greetings! A while ago I made a package for Keil with a project for Discovery STM32F407 board and now, when I use this pack, is recommended the update of the system_stm32f4xx.c file, I did it. I had no problem to compile and run, but some things seemed different, comparing the files I saw they had removed the SetSysClock function. I copied the function from the old file as well the PLL parameters and everything is working again. My question is, without the SetSysClock function which would be the correct way to adjust the clock?