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Question

NRF52832 is using the protocol stack and updated by OTA. Why should the number of FDS Pages of the new firmware be equal to the number of FDS Pages of the old firmware?

Hung Bui · Accepted Answer

Hi, 
 The FDS system was not designed to have flexible storage size. So the size of the FDS data supposed to be fixed in the lifetime of the device. So when you do DFU update and if you change the FDS number of page, the FDS module may get confused and won't be able to continue if you don't reinitialize the flash. 
 Please have a look at this case https://devzone.nordicsemi.com/f/nordic-q-a/52206/fds-change-flash-size-using-dfu