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how to set the address for user data?

I use nrf52832 sdk 14.0

SD+ boot(for ota)+app

In the applicaiton there are some user data to save. I used two pages ( one pages start from 0x6E000 and the other start from 0x6F000).

my user data want to save about 6000 bytes.

on pure circuit board, the app runs rightly, but after Rubberized 4 pcs of 24 runs abnormal and found user data lost.

I wonder if it's the address for user data define error? how to calc the right address which can be used to save user data?

any suggestion is appreciated!

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