Activating the device will make you able to install apps, get push notifications, sync with iTunes and more...

Mount iOS 7 data partition

mount_hfs /dev/disk0s1s4 /mnt2

Go to /var/root/Library/Lockdown

Copy all the files inside that folder

Go to /mnt2/root/Library/Lockdown

If the folder does not exist, create it

Paste files there

Now download this file

And put it in the same folder

Done!