Update to a newer version of a ROM using updated files from another ROM - G4 Q&A, Help & Troubleshooting

I was wondering, theoretically (I'm not planning on doing it, I was just interested as I am trying to find out more about ROM development and how it works), could I take an updated ROM, e.g. Lineage OS 15.1, that is not supported by my device on the latest version, but was supported on the last version, and take a ROM that is working on android 8.1 (the same as Lineage OS 15.1), and combine them together to make a working Lineage OS 15.1 port for my phone.
Is this how porting works?
Sorry if this is the wrong place for a question like this, but I wasn't sure where else to put it.

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Porting a nougat device tree and kernel to oreo (or mm to n)

What is the process of upgrading an older kernel and device tree to a new android version?
E.g. I understand that oreo has a new device tree layout - how do I see that, and once I have got it, where would I start to port oreo to a nougat tree and kernel?
Sorry if this is an silly question - this is the first time I have considered upgrading a device to an unsupported android version and I am not sure where to begin
I've seen this guide referenced before. Not a direct answer to your question though https://forum.xda-developers.com/chef-central/android/guide-android-rom-development-t2814763

I need mondrianwifi 13.0 rom download

Where can I find the LineageOS 13.0 mondrianwifi rom?
It is the last version that runs on my device without any issues. I flashed 14.1, because I couldn't find 13.0, but the camera and flashlight don't work in 14.1. I need the camera for my banking app,
; the app discontinued support for KitKat, and is the entire reason I wiped my factory rom (because sm-t320 isn't supported for os updates by Samsung.)
Does anyone have the link to 13.0? I've been looking for 2 days.
Try this link for one of the last 13.0 builds made for the mondrianwifi http://drive.google.com/file/d/1oZZbqik-fwEeRN8qKHtlF0hkT9TPo46Y/view?usp=drivesdk ... If that link doesn't work for you I might be able to get a pretty stable 13.0 copy I have for smt320 to you... somehow.
Ty so much for this link cause I have been having problems with 14.1 as well.
Thanks for keeping the file up. This was the only way I got this thing working again .

LineageOS and Firmware Question

I am running the latest LineageOS 15.1.
As I switched to LOS directly after my purchase I am wondering if I have to update the firmware separately or if the LOS builds have the latest ones included.
If it is necessary to update them on my own:
Can I use the Firmware files from this thread Doc's Oneplus 5T Firmwares and just flash them, or will I loose my files or brick my device this way?
yes / no
I tried lineageos
but it is laggy and slow
I suggest for you to try aosp based rom like pixel experience
it is better in every way
also use google camera on that rom it is flawless
In the lineage thread there is a separate link for firmware downloads. If you plan on sticking with lineage i'd recommend bookmarking their thread and using the latest firmware from their sourceforge.

Port new lineage os to mako(LG Nexus 4)

Hi. I want to try to build lineage os 17/18 for my old phone. I have env and I already build package for other phone. For Nexus 4 there and only some old lineage os 15 builds. How to prepare lineage os 18 based on lineage os 15? Is it possible or maybe it needs to be done from scratch. Is there any instruction how to do this?
Porting a ROM means there's a similar device with a working LineageOS on it. Which means it's already built, and only small modifications to make it stable for you.
Porting doesn't work the way you described. You can't build Android 12 on top of Android 8, every new major Android update, Google releases a new source code.
Then, manufacturers/developers modify it to their sweets. What you want to do is to build LineageOS 18/17 for an unsupported device. There's a lot of guides online about it. The context matters.
Can you share some links about building lineage os for unsupported devices? Will it help somehow when there are some old versions builds?

Question Is it possible to put a custom ROM?

Has anyone had luck with custom ROMs? I want to put something like Lineage OS but they only made version for Nokia 6, would this version work on this phone?
No but phones as new as this should have a implementation of a vendor partition so u can try out gsi

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