Just acquired a used 1.0.2 with 3.14.08_G serial number 7U741*** imei 01130100****

question is and I tried to search for upgrade instruction. What can I do with it?

Phone has been unlocked, i don't know with what method, does not have installer in it. How do I upgrade to 1.1.1 or 1.1.2?

Can someone help with upgrade info please. Thanks.