Looking to buy either a modified 4,1 or an original 5,1. My question is which one will be officially supported by Apple longer? (Or will there be any difference?) Thinking especially about services like iCloud and iMessages. I understand that a 4,1 can be modified to perform exactly the same as a 5,1– but I have to imagine that if/when Apple decides to shut off this generation of MP from support, they'll be taking SN into account – meaning that a modified 4,1 won't be able to update to the latest generation of OS even if it's performing as a 5,1 machine because it's limited by its serial number. TLDR – is it worth paying the premium for a legit, 5,1 serial number to guarantee longer support from Apple?