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STM32F405: Flash Corrupted after Power Off / Power On cycle

Question asked by negrinni.paolo on Apr 13, 2015
Latest reply on Apr 14, 2015 by negrinni.paolo
i have a problem with a device that use a STM32F405.
Occasionally, after a power off/ power on cycle,  the flash (SECTOR 0) are write to zero for the first 48bytes.
In the application firmware, there is no procedure that write flash at Sector 0 and the option byte are left to their default values.

Any know if there is a problem of flash corruption on the STM32F405 ?!?!