Installing XenServer Hotfixes

[France]

Hi all,

i'm about to install latest three XenServer 6.0.2 hotfixes.
Do i still need to follow whole upgrade instructions (especially 
cloud-prepare-upgrade.sh and cloud-clean-vlan.sh) from:
http://cloudstack.apache.org/docs/en-US/Apache_CloudStack/4.1.1/html/Installation_Guide/citrix-xenserver-installation.html#xenserver-version-upgrading
Or can i just un-manage cluster, install hotfixes, update xenserver 
master first, migrate VM's and reboot hyperivosors?

Tnx.
F.