Toshiba e-STUDIO 2555C Service Manual page 769

SRAM Key FROM Key
Status Status
KeyNull/ KeyNull/
KeyBroken KeyBroken
* AccessFailed, KeyNull or KeyBroken
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<No USB backup data>
1. Reinstall the system software.
 P. 11-5 "11.2 Firmware Updating with 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 "12.1.4Cloning procedure [B]Restore
procedure")
2. Recover the encryption key/license on the SYS board.
Follow the procedures below noted in "9.2.4Precautions
and Procedures when replacing the SYS board".
[C] Restore ADI key (only when ADI-HDD is installed)
[D] Restore encryption key
[E] Restore license
8 - 213
Measure
e-STUDIO2555C/3055C/3555C/4555C/5055C
ERROR CODE AND TROUBLESHOOTING
8