I wrote an updated 2023 guide for this Topic, check it out!
Login via SSH or Console to the switch
Make sure that there is an image on the leaf/spine
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leaf01# dir /bootflash/aci-n9000*
/bootflash/aci-n9000-dk9.11.0.2j.bin
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Make sure that this image is used as bootvar
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leaf01# cat /mnt/cfg/0/boot/grub/menu.lst.local
boot aci-n9000-dk9.11.0.2j.bin
leaf01# cat /mnt/cfg/1/boot/grub/menu.lst.local
boot aci-n9000-dk9.11.0.2j.bin
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If this Image is not set as bootvar, there is a script for that 🙂
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leaf01# setup-bootvars.sh aci-n9000-dk9.11.0.2j.bin
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After the check you can reset the switch
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leaf01# setup-clean-config.sh aci-n9000-dk9.11.0.2j.bin
In progress
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Done
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Just reload the switch
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leaf01# reload
This command will reload the chassis, Proceed (y/n)? [n]: y
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After this process you can rejoin this Switch to the fabric