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flash example can't not run on STM32L4R5QG

Question asked by chueh.fema on Mar 15, 2018
Latest reply on Mar 16, 2018 by chueh.fema

I have two customer boards as below :

A board : Mount with STM32L4R5QII (2MB internal flash)
B board : Mount with STM32L4R5QGI (1MB internal flash)

A board run well on the STM32L4R5ZI-Nucleo\examples\flash many times.
B board will stop a error (program error) as attached file.
If i do a chip erase before run the example on B board it will work on first time.
So i guess the program can't erase the sector correctly .

Any comment , Thanks