Restoring firmware of a KESR-M2-5 CPE device

You can restore the firmware and reset a KESR-M2-5 CPE device to factory settings if you have lost the credentials of that CPE or if you encounter a problem with the firmware.

When a CPE device is reset to factory settings, it is disconnected from the orchestrator. To reconnect the CPE device to the orchestrator, you need to automatically register (ZTP) the CPE device.

To restore the firmware of a KESR-M2-5 CPE device:

  1. Download the firmware archive from the /cpe directory of the distribution kit to the administrator device, for example, your laptop. If you do not know which firmware version you need to install on the CPE device, use the table of correspondence of CPE device models with firmware versions.
  2. Extract the firmware archive to get an archive in IMG.GZ format.
  3. Unpack the IMG.GZ archive to get the firmware image in IMG format.
  4. Use the IMG firmware to create a bootable USB drive using disk image writing software such as BalenaEtcher.
  5. Connect the administrator device to the CPE device with a console cable and insert the USB drive into the USB port of the CPE device.
  6. Specify the settings for establishing a console session with the CPE device on the administrator device, for example, using the PuTTY application, and do the following:
    • Specify the communications port (COM port) number of the administrator device.
    • Specify 115200 as the session speed.
  7. Disconnect and reconnect the power cable of the CPE device. Press F7 or F11 while the CPE device is powering on.
  8. This opens a menu; in the menu, select the USB drive and press Enter.

    The CPE device boots from the USB drive.

  9. Connect the administrator device to the LAN port of the CPE device.

    The administrator device gets an IP address and the IP address of the default gateway in the 192.168.7.0/24 subnet via DHCP.

  10. Connect to the CPE device over SCP, for example using WinSCP. To connect over SCP, specify the IP address and enter the default credentials of the CPE device.
  11. Place the firmware in IMG format in the /tmp directory.
  12. Connect to the CPE device over SSH or establish a console session with the CPE device. To connect over SSH or establish a console session, specify the IP address and enter the default credentials of the CPE device.
  13. Change to the /tmp directory:

    cd /tmp/

  14. Copy the firmware image in IMG format to /dev/sda:

    dd if=<name of the firmware IMG file> bs=1M of=/dev/sda

  15. Restart the CPE device by running the following command:

    reboot

The new firmware version is installed on the CPE device, then the CPE device is restarted. By default, the IP address of the CPE device is 192.168.7.1, and DHCP is enabled on LAN ports.

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