Great god under the guidance of tried many methods, no effect,
The chip for stm32l422rbt6, through the stm32 stlink utility connection device, prompt "always connect to the target"

But inside the keil can normal connection and burning debugging

Stm32 stlink utility version below


In addition, using a serial port burning hex file, burning other hex file failed again, can only burn to write for the first time to write the hex file, and after stlink burning chip can no longer write via a serial port,