D023/D025 2-112 SM
Recovery from a Device Problem
Restoring the encryption key
When replacing the controller board for a model in which the HDD encryption unit has been
installed, updating the encryption key is required.
1. Prepare an SD card which is initialized.
2. Make the "restore_key" folder in the SD card.
3. Make an "nvram_key.txt" file in the "restore_key" folder in the SD card.
4. Ask an administrator to input the encryption key (this has been printed out earlier by
the user) into the "nvram_key.txt" file.
5. Remove only the HDD unit ( p.4-196 "
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