Pre release available now if you can't wait.
Phone should be unlocked to all networks before attempting to flash.
All details on link.... http://www.sammobile.com/2013/02/25/android-4-2-1-jelly-bean-leak-galaxy-ace-2/
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion.
This is not Customer Service so we are unable to help with account specific issues.Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)