when I start a DFU procedure the device is advertising empty packets

[M.Anis]

I'm testing the DFU as described in this link developer.nordicsemi.com/.../a00086.html after reseting in DFU mode, when I start the device discovery, I only get empty packets

bootloader.rar
ble_app_hrs.rar
nrfjprog_win.sh

[M.Anis]

Hi Hung Bui, yes I'm testing with the ble_app_hrs in the SDK v8.1.0. no I didn't do any modification yes I have the bootloader flashed already. in fact the bootloader is working if I use it directly from the service in the hrs example.

but what I want to do is to reset the device in bootloader mode without using the button on the board as described in this link Testing the example without bonding I did all the steps as described but in step 10 10.Verify that the device is now advertising as "DfuTarg". I get the empty packet