unlocked iphone4 upgrade to ios5

i have iphone4 4.0.1 1.59.00 modem firmware being used tmobile. unlocked , jailbroken. i'd update ios 5.
possible update withoul locking phone again?
if not, necessary steps update, unlock, jailbreak etc?

 

you can either use latest version redsn0w (mac/pc) or pwnagetool (mac) upgrade ios 5.0.1 , preserve baseband unlock.

search on www.iclarified.com guide.

 

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