Toshiba e-STUDIO 2555C Service Manual page 786

SRAM Key FROM Key
Status
* AccessFailed
AccessFailed *
OK KeyNull/
KeyBroken
KeyNull/ OK
KeyBroken
KeyNull/ KeyNull/
KeyBroken KeyBroken
KeyMismatch KeyMismatch
* AccessFailed or KeyMismatch
e-STUDIO2555C/3055C/3555C/4555C/5055C
ERROR CODE AND TROUBLESHOOTING
Status
Replace the SYS board.
 P. 9-22 "9.2.4 Precautions and Procedures when replacing
the SYS board" (all steps)
<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
Replace the SRAM board (for the SYS board).
 P. 9-26 "9.2.5 Precautions and procedure when replacing
the SRAM board (for the SYS board)" (all steps)
Recover the ADI key on the SYS board.
 P. 9-22 "9.2.4 Precautions and Procedures when replacing
the SYS board" ([C]Restore ADI key)
Recover the encryption key on the SRAM board.
 P. 9-26 "9.2.5 Precautions and procedure when replacing
the SRAM board (for the SYS board)" ([G]Backup ADI key)
<No USB backup data>
1. Create the partition in the HDD, and reinstall the system
software.
 P. 9-17 "9.2.3 Precautions and procedures when
replacing the HDD"(Perform step 3 or later in "[E]Replace /
Format HDD")
<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
<The error occurs when the SYS board is replaced>
Recover the encryption key on the SYS board. (Transfer the
license from SYS-SRAM to SYS-FROM.)
 P. 9-22 "9.2.4 Precautions and Procedures when replacing
the SYS board"([C]Restore ADI key)
<The error occurs except when the SYS board is replaced>
Recover the encryption key on the SRAM board. (Transfer the
license from SYS-FROM to SYS-SRAM.)
 P. 9-26 "9.2.5 Precautions and procedure when replacing
the SRAM board (for the SYS board)"([G]Backup ADI key)
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Measure
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