Cannot read flash memory after reset using FDS

Question

8738.sdk_config.h 
 Hi, I'm developing an application using internal flash memory. I based on flash_fds example to implement this feature. Now I can write and read data from flash. My basic feature is when device reset It will read data from memory and it will blink led it data I want to read consist in flash memory. In this case I saved "hello !" 
 Here is my code #define FILE_ID 0x0001 /* The ID of the file to write the records into. */
#define RECORD_KEY 0x1111 /* A key for the first record. */

// record using for write
fds_record_t record;
fds_record_desc_t record_desc;
fds_flash_record_t flash_record;
fds_find_token_t ftok;

bool flash_flag = false;
int flash_count = 0;
bool m_fds_initialized = false;

static char const m_hello[] = "hello !";

static void wait_for_fds_ready(void) {
 while (!m_fds_initialized) {
 power_manage();
 }
}

static void fds_evt_handler(fds_evt_t const *p_fds_evt) {
 switch (p_fds_evt->id) {
 case FDS_EVT_INIT:
 if (p_fds_evt->result == NRF_SUCCESS) {
 m_fds_initialized = true;
 }
 break;
 case FDS_EVT_WRITE:
 // NRF_LOG_INFO("write")
 flash_flag = true;
 memset(&ftok, 0x00, sizeof(fds_find_token_t));
 break;
 // case FDS_EVT_READ:
 default:
 break;
 }
}

uint8_t dataFromFlash[100];

int main(void) {
 bool erase_bonds;
 log_init();

fds_register(fds_evt_handler);
 fds_init();
 wait_for_fds_ready();

fds_record_open(&record_desc, &flash_record);
 sprintf(dataFromFlash, "%s", flash_record.p_data);
 if (strstr(dataFromFlash, m_hello) != NULL) {
 blinkLED(orange);

} else {
 blinkLED(yellow);
 }
 fds_record_close(&record_desc);

record.file_id = FILE_ID;
 record.key = RECORD_KEY;

record.data.p_data = &m_hello;
 record.data.length_words = (sizeof(m_hello) + 3) / 4;
 fds_record_write(&record_desc, &record);

while (flash_flag) {

// while (fds_record_find(FILE_ID, RECORD_KEY, &record_desc, &ftok) == NRF_SUCCESS) {
 fds_record_open(&record_desc, &flash_record);
 sprintf(dataFromFlash, "%s", flash_record.p_data);
 NRF_LOG_INFO("%s", dataFromFlash);
 fds_record_close(&record_desc);
 break;
 }
 for (;;) {
 }
} I attched my sdk_config.h