Image upgrade on AWS not working?

Hello,

I’m testing the upgrade procedure (for production hardware currently running Vyatta 6.4) by practicing it on AWS EC2 and following the instructions at http://vyos.net/wiki/Upgrade.

I started an EC2 instance from AMI “Vyatta Core 6.5 R1 x86_64 rev2 (ami-b754c48d)” and dowloaded the VyOS 1.1.6 image, I then set the VyOS image as the “Default” boot and rebooted, but the system still runs the old 6.5R1 image:

vyatta@vyatta:~$ show system image
The system currently has the following image(s) installed:

   1: 1.1.6 (default boot)
   2: Old-non-image-installation

vyatta@vyatta:~$ show version
Version:      VC6.5R1
Description:  Vyatta Core 6.5 R1
Copyright:    2006-2012 Vyatta, Inc.
Built by:     autobuild@vyatta.com
Built on:     Thu Nov 15 19:55:18 UTC 2012
Build ID:     1211151956-334fb58
System type:  Intel 64bit
Boot via:     disk
Hypervisor:   Xen
Uptime:       00:09:50 up 1 min,  1 user,  load average: 0.05, 0.03, 0.01

Could someone explain to me what am I missing? The Upgrade page is specific to mention that the procedure should work on AWS just the same.

In case this matters, here is the version info for the production hardware I intend to upgrade:

vyatta@vyatta:~$ show version
Version:      VC6.4-2012.05.31
Description:  Vyatta Core 6.4 2012.05.31
Copyright:    2006-2012 Vyatta, Inc.
Built by:     autobuild@vyatta.com
Built on:     Thu May 31 07:27:15 UTC 2012
Build ID:     1205310732-388b16c
System type:  Intel 64bit
Boot via:     disk
HW model:     PowerEdge R210 II
HW S/N:       6VR5D2S
HW UUID:      44454C4C-5600-1052-8035-B6C04F443253
Uptime:       00:15:09 up 1 day, 15:26,  1 user,  load average: 0.00, 0.01, 0.05

Thanks.