How to update unlocked AT&T galaxy note to ICS

[sonycat82]

Hi, I just purchased a unlocked at&t galaxy note and want to update to ICS. In the settings, there is a item say "Software update", when I select that and choose Check for updates, it ask if i want to "Check the AT&T server for new software update?"

I am using t-mobile and want to know if its ok if I select yes to "Check the AT&T server for new software update?", will it lock my phone?

Or have anyone follow this instruction to update your phone from I717UCLA1 to I777UCLF6? I guess my biggest concern is will the firmware update lock my phone?
http://www.samsung.com/us/support/SupportOwnersFAQPopup.do?faq_id=FAQ00047453&fm_seq=51497

Thanks in advance for your help!

 

[sonycat82]

I followed the samsung instruction and successfully updated to ICS, it doesn't lock back the phone. Thanks.