Ref : https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/17-9/release-notes/rn-17-9-9800.html#whats-new-1793       x700 series  support is  back (feature parity with 17.3). Upgrade directly from >= 17.3.4c possible. Fix for x700 cer...

           - FYI : https://www.cisco.com/c/en/us/products/security/identity-services-engine/policy-access-control-demo.html  M.

                                     - FYI : https://www.cisco.com/c/en/us/support/docs/field-notices/724/fn72497.html                             https://www.cisco.com/c/en/us/support/docs/field-notices/725/fn72517.html  M.

   - FYI : https://www.cisco.com/c/en/us/support/docs/field-notices/725/fn72539.html  M

             - FYI : https://www.cisco.com/c/en/us/support/docs/field-notices/725/fn72500.html  M.