Hi there,
I justed wanted to add one note to the great tips from my friend Deji (+5 )
You can also use the DVD method here if you prefer;
Upgrading from a Local Source
To upgrade the software from local DVD, follow this procedure:
Procedure
Step 1 
If upgrading from 8.5(1) or earlier complete the"Installing the COP File" section.
Step 2 If you are upgrading software on HP7825H3 or HP7828H3 hardware insert the 16GB USB device to facilitate data migration from the old system to the new installation. For Unity Connection and Business Edition 5000, a 128GB external USB device is required.
If you are upgrading your software on HP7825H3 or HP7828H3 hardware, there is no option to revert to the previous version of Cisco Unified Communications Manager. If you do not back up your system data before starting the software upgrade process your data will be lost if your upgrade fails for some reason. If you chose to revert to the prior version, you will need to install the prior version and restore your data from your DRS backup. Step 3 If you do not have a Cisco-provided upgrade disk, create an upgrade disk by burning the upgrade file that you downloaded onto a DVD as an ISO image.
Note Just copying the .iso file to the DVD will not work. Most commercial disk burning applications can create ISO image disks.
Step 4 Insert the new DVD into the disc drive on the local server that is to be upgraded.
Step 5 Log in to Cisco Unified Communications Operating System Administration.
Step 6 Navigate to Software Upgrades > Install/Upgrade.
The Software Installation/Upgrade window displays.
Step 7 From the Source list, choose DVD.
Step 8 Enter a slash (/) in the Directory field.
Step 9 To use the Email Notification feature, enter your Email Destination and SMTP Server in the fields provided.
Step 10 To continue the upgrade process, click Next.
Step 11 Choose the upgrade version that you want to install and click Next.
Step 12 In the next window, monitor the progress of the download.
Step 13 If you want to run the upgraded software at the completion of the upgrade process and automatically reboot to the upgraded partition, choose Switch to new version after upgrade. The system restarts and is running the upgraded software. If you are upgrading your software on HP 7825H3 or HP7828H3 hardware, there is no option to revert to the previous version of Cisco Unified Communications Manager and you will not be able to choose Switch to new version after upgrade.
Step 14 If you want to install the upgrade and then manually switch to the upgraded partition at a later time, do the following steps, choose Do not switch to new version after upgrade.
Step 15 Click Next. Depending on your configuration, the following text appears:
a. For non-HP7825H3/HP7828H3 hardware:
A Refresh Upgrade requires that the server be rebooted during the upgrade. Services will be affected during the upgrade operation. Press OK to proceed with the upgrade.
b. For HP7825H3/HP7828H3 hardware:
This server model requires a USB storage device in order to proceed with the upgrade. Please insert a USB storage device with at least 16GBytes of capacity. Note that any existing data on the USB device will be deleted.
Note For Unity Connection and Business Edition the USB storage device must be 128 GBytes.
The Upgrade Status window displays the Upgrade log.
Step 16 When the installation completes, click Finish (not applicable for Refresh Upgrades).
Step 17 To restart the system and activate the upgrade, choose Settings > Version; then, click Switch Version.
The system restarts running the upgraded software (not applicable for Refresh Upgrades).
The patch/upgrade files are available via this path on CCO;
Unified Communications Manager / Cisco Unity Connection Updates-8.6(1a)
Cheers!
Rob
