Login via SSH or Console to the switch

Make sure that there is an image on the leaf/spine

leaf01# dir /bootflash/aci-n9000*
/bootflash/aci-n9000-dk9.11.0.2j.bin

Make sure that this image is used as bootvar

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

If this Image is not set as bootvar, there is a script for that 🙂

leaf01# setup-bootvars.sh aci-n9000-dk9.11.0.2j.bin

After the check you can reset the switch

leaf01# setup-clean-config.sh aci-n9000-dk9.11.0.2j.bin
In progress
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Done

Just reload the switch

leaf01# reload
This command will reload the chassis, Proceed (y/n)? [n]: y

After this process you can rejoin this Switch to the fabric