I am on ESD56 (2.01) and I want to go to FRG22D (2.2). What is the best way to get there? Can I do it in one shot or do I need to go step by step by step (and what are the step versions?). Happy to stay un-rooted, with my stock Verizon phone. Am out of the country for a while, I have wifi but no cell or data roaming just now. Thanks for any help.