Does anyone have the J320A Bootloader and Firmware image? - Samsung Galaxy J3 (2016) Questions & Answers

I have the J3 model J320AUCU2AQC1 (ATT) on 6.0.1 and I flashed ENG Boot to root and I tried clean wiping to get rid of the Engineering Bootloader but it is still there and I need the firmware and the bootloader for it on version 6.0.1.

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[Q] Downgrade Lollipop to KitKat, Bootloader & Modem question [N910G]

I am currently on Lollipop on my N910G and I want to downgrade to KitKat by flashing a custom rom in recovery. Do I need to downgrade my bootloader and modem as well? I have been trying to find an Odin flashable bootloader and modem but cant find a download anywhere at the moment.
I went through this process a while ago.
From what I remember, I had to wipe the device in recovery and flash the official kitkat rom.
I think I followed this guide:
http://www.androidexplained.com/galaxy-note-4-how-to-downgrade-to-android-4-4-4-kitkat/

Bootloader question

I don't know if I'm in the correct forum for this, but I'm confused about BL's and need a some assistance. I recently went from a rooted stock ni2 4.4.4 rom to CVertigo1's no-bs bpb1 5.0 rom. I have successfully unlocked my bootloader again and flashed TWRP 3.0.0. Everything's running fine at this point. I want to return to stang5litre's 5.0 dev ed rom that I was running when I ran into a camera failed issue, screwed the phone up and odin'd back to ni2 and rerooted. Phone Info is telling me that I have g900vvru1ani2 bootloader version. I thought I needed to be on a 5.0 bootloader to run a 5.0 rom? BOK3 pda and csc versions and bpb1 baseband.
Do I need to worry about the bootloader?
Can I install stang5litre's rom with my phone the way it is?
I'm able to flash in TWRP, and have used odin repeatedly.
Any help please?
Thanks
Don't know how I didn't see this. Can I follow jrkruse's instructions for updating /downgrading bootloader on page one of the bootloader unlock thread?

Can I still be rooted if I flash firmware 6.0.1?

I'm on G900VVRU2BPB1 and I believe my bootloader is locked as I did root my phone and the samsung unlock app did not unlock my bootloader. I am rooted and I am wondering, there a way for me to go to MM and keep root? Or am I stuck at LP? If I read the information correctly, I am stuck at LP if I want to keep root correct?
If you're CID 11 the bootloader cannot be unlocked. Also there is no root method as of now for marshmallow. You must flash back to PB1 (lollipop) and root and unlock if possible.

[Q] Do I need to unlock my bootloader to flash a new ROM?

I've rooted and flashed ROMs on several phones but this is my first time on a Samsung device. When I did this in the Moto X Pure I had to unlock the bootloader before installing TWRP and flashing a ROM, but I'm not sure if I need to unlock my bootloader in this phone since I already flashed TWRP and rooted through ODIN.
Do I need to unlock the bootloader to flash a new ROM? (TWRP installed and phone is rooted)
The phone is a SM-G900F running stock 6.0.1 btw
No.

ATT Firmware on unbranded with BL2?

Hi I own an unbranded S8 and want to use it on ATT with VoLTE/HDVoice working. If I want to install the newest ATT firmware on this phone with version 2 of the boot loader, is there anything I should be aware of? Should I update the boot loader with the stock unbranded firmware first and then flash via ODIN to the newest ATT firmware that used boot loader V2? Has anyone tried this?
Also, does anyone know what USERDATA should be used for flashing ATT firmware? The ROMs on updato do not have USERDATA, but I have found a USERDATA from an older ROM, but that is months old now.
Last, I would like to keep my phone unrooted and with KNOX intact.

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