I did a upgrade of our ACI Lab Fabric last week and documented all the steps. The upgrade is really straightforward, but hopefully this guide still helps you 🙂
First you have to catch the desired Software, get them directly from cisco. You need APIC Release image for 1.0(3f) release (aci-apic-dk18.104.22.168f.iso) and the Cisco Nexus 9000 Series ACI Mode Switch Software Release 11.0(3f) (aci-n9000-dk22.214.171.124f.bin). Get them here:
Cisco ACI Version 1.0(3f)
I always check the MD5 sum, just to be sure that everything went right with my download.
$ md5 aci-apic-dk126.96.36.199f.iso MD5 (aci-apic-dk188.8.131.52f.iso) = 6e747378ec4225ead0f27cb23aa54f02
The MD5 hash looks right. Check the same for the Nexus 9000 Image!