What is the difference between ST-LINK/V2-1 and V2? Where can I buy v2-1?Or are you buying v2 and updating the firmware?

First of all, I want to use the core above STM32F4. I need a few motors, pumps, and sensor control with the MCU.If there are several boards you recommended due to lack of knowledge of hardware, please let me know how to make a physical connection.