[DEV] [ROM] Pull and modify an existing ROM off a Samsung phone. - Android Software/Hacking General [Developers Only]

Greetings,
I'm embarking on a new journey to rooting and putting a "custom" ROM onto my phone. However I've never modified an android phone, so this process is all new to me.
Obviously the first step would be rooting my phone, but from there I'm stuck. I'm using a Samsung-SM-J320A, and I'd like to keep the main features of the OS (look and data that's already installed), but upgrade the actual Android version. It's currently running Android 7.1.1, though I'd like to upgrade it to 8.1 (Oreo).
I do understand the header of the forum said "no noobs", but I cannot for the life of me find a method to pull the existing ROM that's installed on my phone off and modify it.
Any assistance is welcome. (Apologies if this is not in the right category/titled correctly)

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If you are posting a Question Thread post it in the Q&A forum. Technical discussion of Android development and hacking. No noobs, please. Device-specific releases should go under the appropriate device forum...
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Note: Questions go in Q&A Forum
If you are posting a Question Thread post it in the Q&A forum. Technical discussion of Android development and hacking. No noobs, please. Device-specific releases should go under the appropriate device forum...
forum.xda-developers.com

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Note: Questions go in Q&A Forum
If you are posting a Question Thread post it in the Q&A forum. Technical discussion of Android development and hacking. No noobs, please. Device-specific releases should go under the appropriate device forum...
forum.xda-developers.com

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Note: Questions go in Q&A Forum
If you are posting a Question Thread post it in the Q&A forum. Technical discussion of Android development and hacking. No noobs, please. Device-specific releases should go under the appropriate device forum...
forum.xda-developers.com

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sergeyuskach said:
Hi I have asus tablet model me173x_S_user and trying to update Android version there from 4.2.1.
All of the reference I found was to firmware version which was different. Can you point me how I can update Android on this tablet without bricking it.
thanks a lot in advance.
Click to expand...
Click to collapse
Note: Questions go in Q&A Forum
If you are posting a Question Thread post it in the Q&A forum. Technical discussion of Android development and hacking. No noobs, please. Device-specific releases should go under the appropriate device forum...
forum.xda-developers.com

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Good morning/afternoon/evening!
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TechSupport4944 said:
Good morning/afternoon/evening!
I'm attempting to find and load a custom ROM onto my Samsung Galaxy Tab 4 8.0 (SM-T330NU), but I haven't been able to detect the device with fastboot, nor have I been able to unlock SecureBoot. I'm just asking for some guidance on how to proceed with this. I know Lineage OS isn't compatible with this device, so that's already out of the way. Feel free to ask questions and I'll do my best to answer them!
Click to expand...
Click to collapse
If you are posting a Question Thread post it in the Q&A forum.
No noobs, please. Device-specific releases should go under the appropriate device forum.
Note: Questions go in Q&A Forum
If you are posting a Question Thread post it in the Q&A forum. Technical discussion of Android development and hacking. No noobs, please. Device-specific releases should go under the appropriate device forum...
forum.xda-developers.com

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