How to restore the old encryption key to the machine

The following message appears after the controller board is replaced. In such a case, it is necessary to restore the encryption key to the new controller board.

To do this, follow the procedure below.

  1. Prepare an SD card that has been initialized in FAT16 format.
  2. Using a PC, create a folder in the SD card and name it "restore_key".
  3. Create a folder in the “restore_key” folder and name it the same as machine’s serial number, “xxxxxxxxxxx” (11 digits).

  4. Create a text file called "key_xxxxxxxxxxx.txt" and save it in the "xxxxxxxxxxx“ folder. Write the encryption key in the text file.
    /restore_key/xxxxxxxxxxx/key_xxxxxxxxxxx.txt

    • Ask an Administrator to enter the encryption key. The key has already been printed out by the user and may have been saved in the "key_xxxxxxxxxxx.txt" file.

  5. Turn ON the main power.
  6. Confirm that a message is displayed on the LCD telling to insert the SD card that contains the encryption key.
  7. Turn OFF the main power.
  8. Insert the SD card that contains the encryption key into SD card slot 2 (the lower slot).

  9. Turn ON the main power.

    • The machine will automatically restore the encryption key to the flash memory on the controller board.

  10. Turn OFF the main power when the machine has returned to normal status.
  11. Remove the SD card from SD card slot 2.

How to do a forced start up with no encryption key

If the encryption key back-up has been lost, follow the procedure below to do a forced start-up.

  • The HDD will be formatted after the forced start-up.
  • Encrypted data will be deleted.
  • User settings will be cleared.

  1. Prepare an SD card.
  2. Create a directory named “restore_key” inside the root directory of the SD card. Then, save the “nvram_key.txt” file using the following name:
    /restore_key/nvram_key.txt

  3. Create a text file and write "nvclear".

    • Write this string at the head of the file.
    • Use all lower-case letters.
    • Do not use quotation marks or blank spaces.
    • It is judged that a forced start has been selected when the content of "nvclear" is executed and the machine shifts to the alternate system (forced start).

  4. Confirm that a message is displayed on the LCD telling to insert the SD card that contains the encryption key.
  5. Turn OFF the main power.
  6. Insert the SD card that contains the encryption key into SD card slot 2 (the lower slot).
  7. Turn ON the main power and the machine automatically clears the HDD encryption.
  8. Turn OFF the main power when the machine has returned to normal status.
  9. Remove the SD card from SD card Slot 2.
  10. Turn ON the main power.
  11. Memory clear SP5-801-xx (Exclude SP5-801-001: All Clear and SP5-801-002: Engine), and clear SP5-846-046: address book.
  12. Set necessary user settings with the User Tools key.