Rollback plan for CDH upgrade

[#1]

Hi, We are going to upgrade from 5.8 to 5.15 but we want to check the rollback plan, I've only found rollback of Cloudera manager upgrade but not back from CDH 5.15 to CDH 5.8 (only found from CDH 6 to CDH 5), Where can I find a procedure for rolling back the CDH 5.15 upgrade?

Thanks

[#2]

@Ishkia I suppose you are talking about the CDH parcels, you need just deactive the new parcels, download, distribute and activate the old parcels.