https://devzone.nordicsemi.com/f/nordic-q-a/62639/flash-write-issuehello, I am using SDK 16.0 and I use flash storage to store some value which is critical for our application, when I use fstorage_write as below inside main(), int main() { uint32_t mode=0x22; uint32_t address_reg=0x54000; fstorage_init();en-USTelligent Community 13Tue, 16 Jun 2020 11:49:29 GMThttps://devzone.nordicsemi.com/thread/255236?ContentTypeID=1Tue, 16 Jun 2020 11:49:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4bfe1aed-0ddc-4ac9-8162-e00ca01da255J&#248;rgen Holmefjord<p>Hi,</p> <p>The variable that you pass to the function (<span>uint32_t mode) will go out of scope when the function call returns. fstorage write and erase operations happen asynchronously and may not complete before the function returns. Since you pass a reference to the mode variable to fstorage_write, the content of the address may have changed before fstorage will write the data to flash.</span></p> <p><span>You need to make sure that the variable that is referenced is in scope until the write is complete. This can be done either by using a global variable for passing data to the function or by using a pointer in the function arguments and pass a pointer to a variable that is in scope after the function call returns.</span></p> <p><span>Best regards,<br />Jørgen</span></p><div style="clear:both;"></div>