Hey guys I'm a new member (obviously haha) I've been jailbreaking my i devices since I got my 1st gen in 2007(I think) then got a 3GS this April and now have got a iPhone 4 I enjoy mostly the customisability of jailbreaks which leads me onto my question when I got my iPhone 4 (from vodafone) it came on 4.2.1 am I able to still downgrade?