what are the steps to upgrade to 1.four?

i am listening to a number of different ideas on the forum neatly i had a 1.1.2 otb telephone, and that i upgraded and locked it to 1.1.3 with geohot method. Now i wish to upadte it to 1.four, when itunes ask to replace the cellphone to 1.1.4 must i and unlock and jailbreak with zihpoen?

extra: endured right here

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