Q: Buy a Iphone 3GS in New York and bring to Colombia, Can i update Ios 4.1 to IOs 6.0.1 for Itunes?, preserve the baeeband Claro (Comcel Colombia)

Did you purchase the iPhone unlocked have the carrier in NY unlock it? For more info about unlocking, take a look at this Apple doc -> iPhone: About unlocking

If you did, there shouldn't be a problem.

If not, take a look at this Apple doc -> Unauthorized modification of iOS has been a major source of instability, disruption of services, and other issues

If I updated my macbookair 10.7 to 10.7.5, and the system went blank, it wont even turn on, it should happen to your iphone, unless you have a phone service, i think.

No. I think you could upgrade without any problems.