Write to UICR CUSTOMER register not working

[SK]

Hi,

Update:

Module: nRF52832

SDK v 14.2, SD v5.0, windows platform

I am trying to write to save a value to UICR customer register. My routine for saving the value to the register goes like this: 

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err_code = sd_softdevice_disable();

if(err_code == 0)

{

NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Een<<NVMC_CONFIG_WEN_Pos;

while(NRF_NVMC->READY == NVMC_READY_READY_Busy){};

NRF_UICR->CUSTOMER[4] = 0x0A0A0A0A;

NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren<<NVMC_CONFIG_WEN_Pos;

while(NRF_NVMC->READY == NVMC_READY_READY_Busy){};

printf("HW calibration exited.\r\n");

nrf_delay_ms(5);

NVIC_SystemReset();

}

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

            err_code = sd_softdevice_disable();
            if(err_code == 0)
            {
              NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Een<<NVMC_CONFIG_WEN_Pos;
              while(NRF_NVMC->READY == NVMC_READY_READY_Busy){};

              NRF_UICR->CUSTOMER[4] = 0x0A0A0A0A;

              NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren<<NVMC_CONFIG_WEN_Pos;
              while(NRF_NVMC->READY == NVMC_READY_READY_Busy){};
              printf("HW calibration exited.\r\n");
              nrf_delay_ms(5);
              NVIC_SystemReset();
            }

While debugging, i can see the CONFIG register is changed to Wen and after writing, changed back to Ren. But after rebooting, i dont see the value being written to the register. 

Would  any of you what i am doing wrong here? Followed the process as mentioned in some of the forums here and the reference manual for NRF52832.

Thank you.