Supermicro X11SPG-TF User Manual page 107

Append
Select Yes to add the DBX from the manufacturer's defaults to the existing DBX. Select
No to load the DBX from a file. The options are Yes and No.
 Authorized TimeStamps
Update
Select Yes to load the DBT from the manufacturer's defaults. Select No to load the DBT
from a file. The options are Yes and No.
Append
Select Yes to add the DBT from the manufacturer's defaults list to the existing DBT. Select
No to load the DBT from a file. The options are Yes and No.

OsRecovery Signature
This item uploads and installs an OSRecovery Signature. You may insert a factory default
key or load from a file. The file formats accepted are:
1) Public Key Certificate
a. EFI Signature List
b. EFI CERT X509 (DER Encoded)
c. EFI CERT RSA2048 (bin)
d. EFI SERT SHA256 (bin)
2) EFI Time Based Authenticated Variable
When prompted, select "Yes" to load Factory Defaults or "No' to load from a file.
Update
Select Yes to load the DBR from the manufacturer's defaults. Select No to load the DBR
from a file. The options are Yes and No.
Append
This feature uploads and adds an OsRecovery Signature into the Key Management. You
may insert a factory default key or load from a file. When prompted, select "Yes" to load
Factory Defaults or "No" to load from a file.
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Chapter 4: BIOS