Stm32f407 damaged and overheat when SPI communication is running

[MDavo]

I'm using SPI Protocol in two STM32F407ZGT6 , one master and one slave

Board has 3.3v LDO regulator and Input Voltage has 5v

When power supply connected SPI program correctly work but in this case when disconnect SPI wires and connect again we face of overheating and ic damaged

I read about hot swapping ( replacing or adding components without stopping or shutting down the system ) in the web but can't find any resource in STM32 MCU

[Tesla DeLorean]

The techniques aren't exactly STM32 specific.​

[Uwe Bonnes]

"overheating and ic damaged" is normally a sign of pin voltages above maximum ratings. Review your schematic, wiring and setup/