BIOS recovery
The BIOS recovery is designed to fix the main BIOS, and cannot work if the boot is damaged. The BIOS recovery will not work
in the event of EC corruption, ME corruption, or a hardware related issue. The BIOS recovery image should be available on the
unencrypted partition on the drive for BIOS recovery feature.
Rollback BIOS feature
Two versions of the BIOS recovery image are saved on the hard drive:
●
Current running BIOS (old)
●
To-be-updated BIOS (new)
The old version is already stored on the hard drive. The BIOS adds new version to the hard drive, maintains the old version, and
deletes other existing versions. For example, A00 and A02 versions are already on the hard drive, A02 is the running BIOS. The
BIOS adds A04, maintains A02, and deletes A00. Having two BIOS version enables the Rollback BIOS feature.
If the recovery file cannot be stored (hard drive is out of space), the BIOS sets a flag to indicate this condition. The flag is reset
in the event it later becomes possible to store the recovery file. The BIOS notifies the user during POST and in BIOS Setup, the
BIOS recovery is degraded. BIOS recovery through hard drive may not be possible, however BIOS recovery through USB flash
drive is still possible.
For USB key: root directory or "\"
BIOS_IMG.rcv: the recovery image stored on the USB key.
BIOS recovery using hard drive
About this task
NOTE:
Ensure that you have the previous version and the latest version of the BIOS from the Dell support site available to
use.
NOTE:
Ensure that you have the file type extensions visible in the operating system (OS).
Steps
1. Browse to the location of the BIOS update executable (.exe) files.
2. Rename the BIOS executable files to
BIOS_PRE.rcv
for the earlier version of the BIOS and
BIOS_CUR.rcv
for the latest
version of the BIOS.
For example, if the latest version’s file name is
PowerEdge_T30_1.0.0.exe
, rename it to
BIOS_CUR.rcv
and if the
previous version’s file name is
PowerEdge_T30_0.0.9.exe
, rename it to
BIOS_PRE.rcv
NOTE:
a. If the hard drive is new, there will be no operating system installed.
b. If the hard drive has been partitioned at the Dell factory, there will be a
Recovery Partition
available.
3. Disconnect the hard drive and install the hard drive into another system that has a full operational operating system.
4. Start up the system and in the Windows operating system environment follow these steps to copy the BIOS recovery file to
the
Recovery Partition
.
a. Open a Windows Command Prompt window.
b. At the prompt, type
diskpart
to start the
Microsoft DiskPart
.
c. At the prompt, type
list disk
to list out the available hard drives.
Select the hard drive that was installed in Step 3.
d. At the prompt, type
list partition
to view the available partitions on this hard drive.
e. Select
Partition 1
which is the
Recovery Partition
. The size of the partition will be 39 MB.
f. At the prompt, type
set id=07
to set the partition ID.
NOTE:
The partition will be visible to the operating system as
Local Disk (E)
to read and write data.
g. Create the following folders in
Local Disk (E)
,
E:\EFI\Dell\BIOS\Recovery
.
Troubleshooting
93
Summary of Contents for Latitude 7520
Page 14: ...Major components of your system 1 Base cover 14 Removing and installing components ...
Page 18: ...About this task 18 Removing and installing components ...
Page 37: ...Figure 2 Display assembly with WLAN antenna Removing and installing components 37 ...
Page 38: ...Figure 3 Display assembly with WLAN and WWAN antenna 38 Removing and installing components ...
Page 43: ...Removing and installing components 43 ...
Page 61: ...Removing and installing components 61 ...
