Upgrade XBMC on Apple TV2 v5.x

Open up your terminal/ssh application and enter the following command to log in to your ATV2:
```
ssh root@YOUR.ATV2.IP.ADDRESS
```
EXAMPLE: ssh root@192.168.1.5
You will be asked for a password: default password is alpine

Continue to enter the following commands:

apt-get update

apt-get install org.xbmc.xbmc-atv2