Chapter
4:
UEFI
BIOS
Append
Key
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
Set
New
Key
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
Key
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
select
options
for
Update
for
a
factory
default
key,
or
select
Append
to
get
it
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.
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