Enable UEFI Secure Boot
Optionally, you can enable UEFI Secure Boot. 
There are two methods available to enable UEFI Secure Boot: 
•  From Lenovo XClarity Provisioning Manager V3
To enable UEFI Secure Boot from Lenovo XClarity Provisioning Manager V3: 
1.  Start the server and press F1 to display the Lenovo XClarity Provisioning Manager V3 interface.
2.  If the power-on Administrator password is required, enter the password.
3.  From the UEFI Setup page, click System Settings ➙ Security ➙ Secure Boot.
4.  Enable Secure Boot and save the settings.
•  From Lenovo XClarity Essentials OneCLI
To enable UEFI Secure Boot from Lenovo XClarity Essentials OneCLI: 
1.  Download and install Lenovo XClarity Essentials OneCLI.
To download Lenovo XClarity Essentials OneCLI, go to the following site:
https://datacentersupport.lenovo.com/solutions/HT116433
2.  Run the following command to enable Secure Boot:
OneCli.exe  config  set  SecureBootConfiguration.SecureBootSetting  Enabled                     
--bmc  <userid>:<password>@<ip_address>
where: 
–  <userid>:<password> are the credentials used to access the BMC (Lenovo XClarity Controller 
interface) of your server. The default user ID is USERID, and the default password is PASSW0RD 
(zero, not an uppercase o)
–  <ip_address> is the IP address of the BMC.
For more information about the Lenovo XClarity Essentials OneCLI sseett command, see:
http://sysmgt.lenovofiles.com/help/topic/toolsctr_cli_lenovo/onecli_r_set_command.html
Top cover replacement
Follow instructions in this section to install or remove the top cover.
Remove the top cover
Follow the instructions in this section to remove the top cover.
About this task
S014 
CAUTION: 
Hazardous voltage, current, and energy levels might be present. Only a qualified service technician is 
authorized to remove the covers where the label is attached. 
S033 
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ThinkSystem SR850 V2 Maintenance Manual