Upgrading a DCM using a USB stick


  • A USB stick prepared with the CMG-DCM-mk2x firmware.
  • Cable CAS-DCM-0038.
  • Command line access to the DCM (either serial cable or ssh).


  1. Do not connect the USB cable or stick at this time.
  2. Log in to the DCM as root.
  3. Issue the following commands, which will switch off automatic disk access. Ignore any errors or messages:
    svc Pt-storage stop
    svc rdisk stop
  4. Connect the USB cable and the USB stick.
  5. Mount the USB stick with the command:
    mount -o ro -t ext2 /dev/sda1 /mnt

    If this does not work, try the following:

    • Ensure you have waited 10 seconds
    • Try changing ext2 to ext3 or ext4
    • Check the kernel log to see what the device was called with the following command:

      In the last few lines of output there should be something like:

      sd 46:0:0:0: [sdb] 15826944 512-byte logical blocks: (8.10 GB/7.54 GiB)
      sd 46:0:0:0: [sda] Write Protect is off
      sd 46:0:0:0: [sda] Mode Sense: 43 00 00 00
      sd 46:0:0:0: [sda] Assuming drive cache: write through
      sd 46:0:0:0: [sda] Assuming drive cache: write through
       sda: sda1
      sd 46:0:0:0: [sda] Assuming drive cache: write through
      sd 46:0:0:0: [sda] Attached SCSI removable disk

      Check that the token sda1 matches the token in /dev/sda1.

    If this still fails, the unit will need to be upgraded by some other method.

  6. Run the command:
  7. Reboot the CMG-DCM.

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