Entering Serial DFU mode from the application layer

Question

Hi, I am try to implement UART SERIAL Bootloader for my device and I just need to perform DFU using uart serial 
 I have tested the code and bootloader. My query is 
 Without pressing BUTTON_4 and Power reset how to enter to DFU mode from the application layer 
 Buttonless UART Serial Bootloader!!

Einar Thorsrud · Accepted Answer

You do not need to do all that. To just enter DFU mode, simply: 
 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);

 NVIC_SystemReset();

Entering Serial DFU mode from the application layer

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