Dear All ,I used the STM32L4 series controller in that I want to write one string in Non-Erasable memory location, also I want to change it using programming. that is changing of string will be done by my program and stored location will be Non-Erasable

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Wants to stored that string in non-erasable memory location . when I off the power supply it should be present .

also I want to change that string at running the program

I have search on net

Any help will be highly appreciated.