I have a windows 7 netbook with one of the newest itunes versions. Im installing it on my iphone 5s model a1533. Is this a GSM/CDMA or just CDMA? Im using Verizon. Also After I update to the GM, will i be able to update to the OTA update next week? Will i be able to update to future updates like 8.1? Or will i have to downgrade to 7.1 before i do these? Thanks in advance.