OK thanks for the help.For your phone, first upgrade the firmware through ODIN, then flash a 4.3 TW rom through custom recovery.
For your fiance, if her's comes with 4.3, you can only root. You cannot go back to 4.1.2 without a brick. No unlocked bootloader as of now, so no rom flashing. I've read a few unconfirmed posts about being able to go back, but the overall concept is to accept 4.3 if you already have it.
Sent from my SCH-I605 using xda app-developers app
It's terrible there are no new(er) unlocked phones out there on Verizon right now. Pretty disappointing. I know the s4 and note 3 have safestrap but I've never had great experiences with it so that puts me off a lot.
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