Originally Posted by Perseus71
Thanks for doing some research before posting. Its refreshing to see you picked up basics even if you have never used this model before.
No problem. I work in IT, so I know the frustration of someone asking for help without even trying to do any basic research first
You didn't mention if there's a custom recovery such as TWRP or CWM. If it was there and you were brave or comfortable enough, I'd have suggested a 4.1.1 modem to flash (UVDLJC).
Looks like I should have done my research a bit better. I misunderstood, thinking that Odin was some sort of recovery. Just looked up how to get into recovery, and it looks like stock to me (it just reads Android system recovery 3e). So, it is possible to just simply flash LJC modem on 4.1.2 so I can unlock, or am I misunderstanding?
So to your question on unlock, essentially, your best bet is to flash a Root66 of UVDLJC version. Read the first post of Root66 completely word for word before you download and flash. Less chances of hard brick that way. A Root66 is a Galaxy S* family term for rooted stock firmware. It just has root injected in it. Everything else is just stock. So it does not trip the flash counter.
Now your counter is already tripped. So you will have to use Triangle away as you already know. So after Root66 and Triangle Away, you will be all stock and good to go. Follow the process for unlock as you have already found out and then go with ATT.
Just to make sure I understand correctly, it IS Triangle away first, then Route66 second? If I'm interpreting correctly, I can do this even if not rooted? All the devices I've ever flashed ROMs to before (even when going back to stock ROM) needed a custom recovery and/or root. But, since this device doesn't appear to be rooted, I just wanted to make sure I don't need to root before flashing Route66.
Now if you wish, after the unlock, you can flash UVDMD5 version of Root66 and you will get JB 4.2.1. Do not flash UVUEMJC version of Root66. Locked bootloader and efuse hardbrick lie in that direction.
Thank you so much for the information. Once I get everything in order, and the SIM unlocked, I'll probably spend many hours researching how I want to progress (so you've already helped cut down that time). I honestly haven't come across modem flashing in previous devices, so I will definitely need to read more to fully understand the implications.
Out of curiosity, do you have any theories on how the flash counter was tripped? Everything appears to be stock, but the flash counter and device status seem to indicate otherwise. Just trying to figure out the history of this device. Again, thanks so much for the help.