I live in NA and i have a w580i from at&t but its unlocked so i can use it with my T-Mobile sim. Now i read the tutorial and there is nothing about what i am going to ask.

My phones firmware is R7CA001 i want to upgrade to the firmware R8BE001 do i have to unlock my phone all over again after the upgrade.

How do I know which upgrade to use RED52 or RED53.

thank in advance and 1 love and god bless.