Security Settings
M160/M161 2-78 SM
Encryption Key Restoration
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. (The function of back-up the encryption key to the SD card directly is
provided 11A products or later.)
5. Turn on the machine’s main power switch.
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 switch.
8. Insert the SD card that contains the encryption key into Slot 2 (the lower slot).
9. Turn on the main power switch.
The machine will automatically restore the encryption key to the flash memory
on the controller board.
10. Turn off the main power switch when the machine has returned to normal status.
11. Remove the SD card from Slot 2.
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