nrf52811 dfu issue

Hi, I'm a novice in embedded systems. I have board based on nrf52811 and firmware written for my device but when I received my board from production I could not load firmware because there is no DFU on board.  I see device as AT 52811 and I can connect but no option to load firmware. 

I understand that I will probably need to make DFU bootloader using nrf util but I am not sure that I will be able to load the current firmware with the DFU bootloader that I made. Also board is very small with just a couple of sensors and it was intended to be updated over Bluetooth. Is it possible to load DFU bootloader over BT or device must be connected to the PC to do so?

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  • I set battery in device and powered development kit via usb. I was able to see both original device and new device. I've read and saved  hex file from old device and than did erase and write to new device. All done with nrf programmer. But new device still does not work although memory map looks same like old device. I checked devlopment kit log and I saw that firmware was not protected. So simple read from old and load on new device should work or?

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