Toshiba e-STUDIO477S Service Manual page 165

SRAM Key FROM Key
Status Status
KeyNull/ OK
KeyBroken
KeyNull/ KeyNull/
KeyBroken KeyBroken
* AccessFailed, KeyNull or KeyBroken
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Recover the encryption key on the SRAM board.
 P. 6-22 "6.2.5 Precautions and procedure when replacing
the SRAM board (for the SYS board)" (for the SYS board, [H]
Backup encryption key)
<No USB backup data>
1. Reinstall the system software.
 P. 8-4 "8.2 Firmware Updating with a USB Device"
<With USB backup data: All key data recovery>
1. Recover all the data on the SRAM board.
[5] + [9] + [POWER]  2. Restore SRAM Data from USB
(For details, see "9.1.4Cloning procedure [B]Restore
procedure")
2. Recover the encryption key/license on the SYS board.
Follow the procedures below noted in "6.2.4Precautions
and Procedures when replacing the SYS board".
[C] Restore ADI key (only when ADI-HDD is installed)
[D] Restore encryption key
[E] Restore license
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Measure
e-STUDIO477S/527S/477SL
ERROR CODE AND TROUBLESHOOTING
5