iPhone Factory Unlocked iPhone 3GS


i have many questions unlocking process of factory unlocking iphone 3gs. first, if upgrade 4.3.2 5.1.1 while preserving baseband, phone still factory unlock? second, if downgrade (while preserving baseband or while not preserving baseband) still factory unlocked? answers!
 

if phone imei unlocked, firmware , baseband irrelevant.
stay unlocked.
 


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