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If N5K/6K BIOS is corrupted and running version blank, install operation proceeds but fails to boot up after an upgrade. esc-6004EF# install all kickstart bootflash:n6000-uk9-kickstart.7.1.3.N1.3.bin system bootflash:n6000-uk9.7.1.3.N1.3.bin Images will be upgraded according to following table: Module Image Running-Version New-Version Upg-Required ------ ---------------- ---------------------- ---------------------- ------------ 0 system 7.1(1)N1(1) 7.1(3)N1(3) yes 0 kickstart 7.1(1)N1(1) 7.1(3)N1(3) yes 0 bios v2.9.0(12/10/2014) yes <<Running BIOS version is blank 0 power-seq v5.0 v5.0 no 0 fabric-power-seq v3.0 v3.0 no 1 power-seq v2.0 v2.0 no 2 power-seq v4.4 v4.8 yes 2 century-fpga v16.0 v16.0 no 7 power-seq v2.0 v2.0 no 0 microcontroller v1.1.0.4 v1.1.0.4 no Do you want to continue with the installation (y/n)? [n] n esc-6004EF#
Usually seen when upgrading from 7.1(1)N1(1) where there is a bug CSCut86026 due to which /var/tmp is full.
Do not proceed with upgrades or reload on such systems which has BIOS corrupted. Contact Cisco TAC to manually update the BIOS.
Running version of BIOS is corrupt. This can usually happen when system directory /var/tmp is full and install command is issued to a version which has newer BIOS. The install commands aborts with following error.
But on subsequent install commands goes through and the system does not boot up due to corrupt BIOS