for people who tried flashing twrp and DID NOT BACKUP!!!!!!!! here is the stock lp recovery for at&t d850 lg g3 from Flashify.
Do you have any friends with T-Mobile that would let you borrow their SIM card to try and use the device unlock app? I'm just throwing a fart in the wind here hoping it catches in a net for you.
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Yeah. I'm waiting on an sbf/fxz for it. Unless you've found it?
i'm not sure WHEN they did it... but it now is actually 4.4.3. just figured i'd point that out