Out-of-band methodFor information about using the IMM web interface to recover the UEFI firmware,see the IMM documentation.Nx boot failureThis topic provides information about Nx boot failure.Configuration changes, such as added devices or adapter firmware updates, andfirmware or application code problems can cause the server to fail POST (thepower-on self test). If this occurs, the server responds in either of the followingways:v The server restarts automatically and attempts POST again.v The server hangs, and you must manually restart the server for the server toattempt POST again.After a specified number of consecutive attempts (auto or manual), the Nx bootfailure feature causes the server to revert to the default UEFI configuration andstart the Setup utility so that you can make the necessary corrections to theconfiguration and restart thr server. If the server is unable to successfully completePOST with the default configuration, there might be a problem with the systemboard.To specify the number of consecutive restart attempts that will trigger the Nx bootfeature, in the Setup utility, click Settings > POST Attempt Limit . The availableoptions are 3, 6, 9, and 255 (disable Nx boot failure).Confirm and recover IMM boot image failureThis topic provides instructions for how to confirm and recover IMM boot imagefailure.Check the system management heartbeat LED to confirm whether the uBoot failsto boot. Normally, system management heartbeat LED on the planar will startblinking rapidly when the ac cord is plugged to the system. It will then turn toslow blink after some time (usually within 5 minutes). This indicates IMM systemhas started up and firmware application is starting to load. It will usually grantpower permission to the server system within 1 minute after the heart beat LEDslows down. Be careful here, this system management heartbeat LED is not thepower button. It’s a LED locates on the system board which you may need toremove the cover to check. The location of x3850X5 system management heartbeatLED is CR33 (Refer to the "Microprocessor board non-light-path-diagnostics statusLEDs" table, see “Microprocessor-board LEDs” on page 24).If the system management heartbeat LED doesn't blink, it confirms that Uboot failsto boot. In this case, try the following method to recover Uboot.1. Power off the system, unplug the power cord.2. Remove the cover and close the Backup Uboot jumper J75-A5.3. Plug the power cord and start to boot the IMM from backup uBoot code.4. If IMM is back running normally and accessible, update latest IMM firmwarethrough in-band or out-of-band method.5. Power off the server, disconnect the power cord from the server. Remove thecover and open the hardware jumper.Chapter 3. Diagnostics 75
