If the encryption key is printed on paper, first get an SD card ready to enter the encryption key. If you have already stored the encryption key on an SD card, start this procedure from step 6.
- Prepare an SD card that has been initialized in FAT16 format.
- Using a PC, create a folder in the SD card and name it "restore_key".
- Create a folder in the “restore_key” folder and name it the same as the machine’s serial number, “xxxxxxxxxxx” (11 digits).
Create a text file called "key_xxxxxxxxxxx.txt" and write the encryption key.
Write this string at the head of the file.
Use all lower-case letters.
Do not use quotation marks, line breaks, or blank spaces.
Save the text file in the "xxxxxxxxxxx“ folder created in Step 3.
/restore_key/xxxxxxxxxxx/key_xxxxxxxxxxx.txt
Turn the power switch ON.
Confirm that a message is displayed on the LCD telling to insert the SD card that contains the encryption key.
Turn the power switch OFF.
Insert the SD card that contains the encryption key into the machine's rear SD card slot.
With a model equipped with a microSD card, after replacing the controller board, remove the NVRAM and microSD card from the old controller board and install them on the new controller board.
Turn the power switch ON.
The machine will automatically restore the encryption key to the controller board.
Turn the power switch OFF after the restoration is completed.
Remove the SD card.
Turn the power switch ON.
After a message is displayed on the LCD telling you to initialize the micro SD card, turn the power switch OFF (Do not press “Initialization” button)
Check whether the microSD card has been replaced in step 10.
If the microSD card has not been replaced, turn the power off without pressing the “Initialization” button, install the microSD card on the new controller board, turn the power back on, and then press the “Initialization button. If you press the “Initialization” button without replacing the microSD card, the data in the microSD card cannot be recovered.