Symptom:
HIF ports on all the IOM modules attached an FI stays in 'Admin Down'

`show fex detail`
FEX: 1 Description: FEX0001   state: Online
  FEX version: 5.0(3)N2(2.11.3e) [Switch version: 5.0(3)N2(2.11.3e)]
  FEX Interim version: 5.0(3)N2(2.11.3e)
  Switch Interim version: 5.0(3)N2(2.11.3e)
  Chassis Model: N20-C6508,  Chassis Serial: FOX1633GSZC
  Extender Model: UCS-IOM-2208XP,  Extender Serial: FCH16427ECP
  Part No: 73-13196-04
  Card Id: 136, Mac Addr: ac:f2:c5:2e:44:0e, Num Macs: 42
  Module Sw Gen: 12594  [Switch Sw Gen: 21]
  post level: complete
 pinning-mode: static    Max-links: 1
  Fabric port for control traffic: Eth1/18
  Fabric interface state:
    Po1153 - Interface Up. State: Active
    Eth1/17 - Interface Up. State: Active
    Eth1/18 - Interface Up. State: Active
  Fex Port        State  Fabric Port
         Eth1/1/1  Down        None
         Eth1/1/2  Down        None
         Eth1/1/3  Down        None
         Eth1/1/4  Down        None
  ...

Conditions:
This happened after adding a replaced FI to the cluster which was upgraded