Getting the error while copying the configuration from one volume to an other volume with different version

The BIG-IP F5 version of the target boot location must be the same or later than the version of the source boot location. If the specified target boot location is an earlier version than the source boot location

Actual/Source version 12.1.3.5

New Version: 12.1.3.2

New Version is lower then Actual Version. That's the reason you are getting error.