hey whats up, this has probably been asked a million times but i need some help and assurance. i have my phone jailbroken on 4.2.1 and since then 4.3 has came out. i want to unjailbreak my phone but i dont want to brick my phone. id just like to update my phone and unjailbreak it. what steps should i take in order to update and unjailbreak my phone? thanks in advance!