52820 Unable to set the registers via sd_power_gpregret_clr and sd_power_gpregret_set.

[xiami]

Hi,
I want to enter the DFU by setting the register.But when the sd_power_gpregret_clr and sd_power_gpregret_set are set to set the register, and the err_code is 0x02 is returned.

my code：
uint32_t err_code;

err_code = sd_power_gpregret_clr(0,0xffffffff);
VERIFY_SUCCESS(err_code);
err_code = sd_power_gpregret_set(0, BOOTLOADER_DFU_START);
VERIFY_SUCCESS(err_code);
nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_DFU);

[xiami]

SDK Version：17.1.0_ddde560
softdevice Version：s112_nrf52_7.2.0_softdevice
demo：ble_app_hids_keyboard_pca10100_s112

[xiami]

User nrf_power_gpregret_set()  should be called when softdevice  is not enabled.