I have a CCM 18.104.22.16800-5 that should be upgraded to 8.6.
As mentioned in http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/compat/ccmcompmatr1.pdf , a direct upgrade is not possible.
I suppose an upgrade to 7.1x and then to 8.6 is not possible either, because 7.1x is EoS.
How can this be done? A new installation from 8.6 and a restore from 7.0.2?
Thanks for a hint.
If remember correctly, CUCM doesn't supports cross-release restore (wow).
If so, your only choice is either somehow obtain 7.1 media , or BAT export, and re-import.