Building a Custom ROM based on newer Android version? - Android Q&A, Help & Troubleshooting

Hi everyone,
I'm considering building a new Custom ROM for my Teclast X98 Plus tablet to get new features and security updates.
However I've never done that before, but as there are other Custom ROMs I think it must be possible somehow
The Android version of the original firmware is 5.1, also Mireks ROM for the tablet is based on that and also the available Remix OS 2.0 I guess.
My question is: Do you think it is possible to build a mostly working ROM based on a newer version like Marshmallow, Nougat or even Oreo?
And is it possible to extract the proprietary blobs and drivers from an existing ROM and get them working on the newer Android?
I've seen that on other devices, but I don't know where they got the blobs and other stuff needed.
Any input would be appreciated

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Finding custom rom for porting

Hello, mates,
I decided that I am not happy about my device stock rom, so i decided to make a custom rom port for my device....
Well i read a lot easy guides and watched loads of videos about easy porting, BUT looks like there is nothing easy with my device.
My device is Huawei Y7 it is upgradeable only to 7.0 Nougat. It wouldnt be a problem to find such custom rom but again my device has Snapdragon 435 processor... There is very little devices with such processor and most of them already has 7.1.2 nougat and all custom roms are this version or even 8.0 Oreo.
First question would be: Is there something i could do about that ? ​

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As the title States, is there any oxygenos stable pie ROM available for our device, if it's not available I'd request anyone to port for our beloved device. Undoubtedly oxygenos is better atleast to me it's better than stock. I'd like to see it, as it got ported to many devices like rn5, rn4, 4 and so on. Thank you.
Stone M2 said:
As the title States, is there any oxygenos stable pie ROM available for our device, if it's not available I'd request anyone to port for our beloved device. Undoubtedly oxygenos is better atleast to me it's better than stock. I'd like to see it, as it got ported to many devices like rn5, rn4, 4 and so on. Thank you.
Click to expand...
Click to collapse
I'd say until this gets ported, if it does.... Try Lineage OS., its basically stock android with extra features, quite similar to Oxygen OS, and the OnePlus devices originally had Cyanogen OS (Lineage OS predecessor) installed on them.
You could also try this magisk module, it would bring some of the OxygenOS features to any ROM as long as you have Magisk installed.
https://forum.xda-developers.com/apps/magisk/oxy-ify-magisk-module-add-oxygen-os-t3888094

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I've searched everywhere, but I can't find how developers build a custom ROM with a newer Android version when the stock ROM no longer updates, for example, Lenovo A6000 updates stopped on Lollipop, but devs can build ROMs with Pie. How can they do this?

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I like to think that they are better when it comes to customize my device...
Thank you all for your answers!
I posed a similar question a few days ago about stock vs customer Roms but no replies. My general feeling is that with the stability of a the stock Huawei and a few non root tweeks (ADB bloatware removal and another launcher) I have a very stable usable and snappy phone... However each person uses their phone differently. I hope so either weigh in for you.
It depends on what you're doing with your device, it is stock android p is already OTA and my personal opinion is keep stick to stock because this is not a flagship device and moderators are give up easily.

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