DFU is not performed

[J.Kwon]

I'm using the PCA10028, ble_app_hrs_dfu(sdk11).

Only the three screens below were repeated infinitely when I started to upgrade the softdevice through DFU.

And the GATT error occured when I started to upgrade the application.

I didn't modify ble_app_hrs_dfu example.

Why doesn't the DFU work?

[bjorn-spockeli]

Have you flashed the bootloader to the nRF 51 DK along with the ble_app_hrs_dfu example and the S130 SoftDevice?

[J.Kwon]

Thank you. I did not know about the existence of the boot loader.