Converting a Nexus9000 switch to ACI mode is fairly easy as compared to vice versa. You need to download the ACI image for the switch & upload it in switch bootflash nxos-switch1# copy tftp: bootflash: nxos-switch1# no boot nxos (This
How to Convert a ACI Nexus9000 Leaf to NX-OS Mode
How to Convert a ACI leaf to NX-OS Mode