The same way you rooted your phone? with the recovery-new.img ?
Download a firmware which is compatible with your phone.
rename the .zip to update.zip and put it on your SD
(fastboot via CMD, type the following commands on your desktop not on the device):
fastboot boot recovery-new.img
Fastboot, back-up with nandroid, reboot.
Copy nandroid folder from SD to your PC. (If you want to go back to Vodafone firmware)
Put update.zip on the SD and fastboot again.
Whipe and update.
(whipe clears everything.)
I got the Google ION R3 Lite from nk02.
And i have a Dutch Vodafone Magic.