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How to save data persistently(non-volatile) to nRF51 core not effected by powering off and on?

How to save data persistently(non-volatile) to nRF51 core not effected by powering off and on?

(How to save static data persistently without deleted when the core is turned off and on?)

I think there is some kind of an Peer manager saves other Peripheral's Address persistently to it's Flash Memory to find out later if it is previously connected devices or not.

How Can I use it to save some application's static data? such as Application's Own Flag, or Scanned Device's Address, Application Data or Etc?..

I found an example of fatfs, and Do I really have to use filesystem format to save some application data?

What is the easiest way to save these data without being volatiled? (either using Softdevice or not)

(I'm really having hard time with saving these data... but I can't find what is the most appropriate or easily manageable way to save these data..)

ps.. not using SD Card.. + BY Softdevice S130?

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