Nx-Boot Failure - Lenovo System x3550 M5 Installation And Service Manual

For instructions for recovering the UEFI firmware, see "Recovering the server firmware (UEFI update failure)"
on page 91. After you have recovered the firmware in the primary bank, complete the following steps:
Step 1. Restart the server.
When the prompt Press F3 to restore to primary is displayed, press F3 to start the server from
Step 2.
the primary bank.

Nx-boot failure

Configuration changes, such as added devices or adapter firmware updates, and firmware or application
code problems can cause the server to fail POST (the power-on self-test).
If this occurs, the server responds in either of the following ways:
• The server restarts automatically and attempts POST again.
• The server stops responding, and you must manually restart the server for the server to attempt POST
again.
After a specified number of consecutive attempts (automatic or manual), the Nx-boot failure feature causes
the server to revert to the default UEFI configuration and start the Setup Utility so that you can make the
necessary corrections to the configuration and restart the server. If the server is unable to successfully
complete POST with the default configuration, there might be a problem with the system board.
To specify the number of consecutive restart attempts that will trigger the Nx-boot failure feature, in the
Setup Utility, click System Settings ➙ Recovery ➙ POST Attempts ➙ POST Attempts Limit. The
available options are 3, 6, 9, and 255 (disable Nx-boot failure).
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Lenovo System x3550 M5 Installation and Service Guide