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nRF52840 Dongle How to Command with a terimal and how to change a firmware with a SDK Zephyr

Hi Guys,

I want to use nRF52840 Dongle as "BLE central UART".

In the first step, i used a nRF52840 Dongle with a  Bluetooth low Enegy app  in a nRFConnet, the result is corret.

but i have to questions:

  1. How to command a nRF52840 Dongle with a windows terminal ? What command to send to the dongle to detect a BLE peripheral device?
  2. I am trying to change a firmware into a Dongle, I created a zephir project. I switch a dongle into a bootloader mode. When i want download a firmware into a dongle with app Programmer, i have an error

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2021-08-27T19:05:00.195Z INFO Hash is generated by SHA256
2021-08-27T19:05:00.203Z INFO Performing DFU. This may take a few seconds
2021-08-27T19:05:00.235Z INFO DFU procedure starts. This may take a few seconds.
2021-08-27T19:05:11.433Z INFO DFU for Application completed successfully!
2021-08-27T19:05:11.434Z INFO 0 dfu package(s) left.
2021-08-27T19:05:11.434Z INFO Waiting for device
2021-08-27T19:05:16.436Z ERROR Reopen device failed: Timeout while waiting for device EB0B6E1EDC22 to be attached and enumerated
2021-08-27T19:05:16.437Z INFO Nordic DFU Trigger Interface was not found.Please physically reset device.
2021-08-27T19:05:16.454Z ERROR Device not found due to failure during DFU
2021-08-27T19:05:17.555Z INFO Target device closed.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Please to help me?

Thanks,

Vincent