How to flash the SoftDevice, the bootloader and the application at once?

Question

I have tried to merge the hex files using mergehex, and flashed it to my device. 
 After flash the device is in DFU mode. 
 It seems the booloader doesn't know that there is a valid application there.

Petter Myhre · Accepted Answer

The bootloader believes the application is invalid, and that it is why it is entering DFU mode. 
 The bootloader settings tells the bootloader if the application is valid or invalid. Please see bootloader_types.h. The settings are stored in the last page of the flash, at address 0x3FC00. 
 One way to convince the bootloader that it has an valid application is to create the bootloader settings manually, in a separate hex file, and merge it with the other hex files. 
 To convince the bootloader that the application is valid bank_0 must be 0x01 and bank_0_crc should be 0x00. 
 Merge this hex with the SoftDevice, the bootloader, and the application using mergehex. Flash the merged hex with nrfjprog, and you should be good to go.

How to flash the SoftDevice, the bootloader and the application at once?

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