You just have to delete the files that were extracted from the IdentityIQ installation.
- Files inside WEB-INF\efixes
- Jar files in WEB-INF\lib
- Then replace the original jar files in WEB-INF\lib from your backup identityiq.war
- Restart the server
Any Efix usually goes to custom class files, they provide , this is same with latest one as well
Just check above link you will get an idea on rollback.