Porting older android version on MTK - Upgrading, Modifying and Unlocking

Hi everyone! A long time ago i've heard that it's not possible to port older android version on newer kernel, however it seems strange, since major kernel version stay the same(3.x). I've tried myself sometime ago(i have some exp in porting firmwares, but i've ported custom ROM of same version) but got bootloop(from 6.0 to 4.2). Have anyone got some success in porting older android version?

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Update old phone

Hello, I found my old HTC 10. I tried to upgrade it to a newer rom. It's currently running an old Cosmic OS rom. Can anyone tell me based on the images, what I have to update?
Information https://imgur.com/gallery/IxBHkud
Go to this forum, your answer is there.
https://forum.xda-developers.com/htc-10/development

About Custom ROMs Android versions

Just a silly question. Why the most ROMs for Moto Z2 Play are based on Oreo?
I have this device since 2017, updated until Android Pie via OTA, but I want to change for something different than stock ROM.
The problem is, most ROMs still based on old version of Android and I don't want to downgrade.

Custom ROM for Galaxy S5 G900T - Are older Lollipop 5.0 based ROMs still available?

I'm new to flashing ROMs... originally rooted my S5 in 2016, but am just now getting around to flashing a rom. My phone runs on Lollipop 5.0. I'm concerned that the hardware will no well support ROMs based on Android 10, 11 & 12 - which is what I'm seeing everywhere.
1. If I flash the newer versions on LineageOS, will they work correctly on my phone?
2. Can I still use ROMs based on Lollipop 5.0 - If so, where can I find them?
Thanks!

Which version of Android ? 4.4 or 5.1 for mtcB/C ?

I recently had to learn a lot about my old headunit because it suddenly did not boot.
I tested both Android 4.4 and 5.1 on my car stereo. But many links are disabled
I currently have ROM 4.4.4 of the rooted version of malaysk and it has a good speed, but some software no longer supports Android version 4.4.4 like waze
Some users have said that by installing the rooted version of Android 5.1 and removing a series of default programs, the ROM speed will be adjusted and maybe even faster than Android 4.4.4.
I have now found three versions of Android 5.1.1:
1- Factory version 5.1.1
2- custom version of malaysk user
3- Custom version on another site called booroondook
I installed the factory version and the speed was slower than version 4.4 and it was slower when opening the software. The amount of memory available in this version is low and with the installation of several software errors can be seen filling memory.
Using rooted versions increases the available memory as well as the ability to delete additional programs
Are custom 5.1 ROMs faster than the factory and good stability?
If yes, which ROM?
And finally, did anyone like me have the problem of not connecting to the iPhone 12/13 hotspot in version 5.1 of Android or not? Because this problem does not exist in version 4.4. ...
I tested the custom ROMs 5.1.1. There was a problem not connecting to the iPhone 13 hotspot in all ROMs.
Finally I installed ROM 4.4.4 micro g version
Very good speed
Increased internal memory
Beautiful appearance
Rooted
No problem connecting to iPhone 13 hotspot
Very light Of course,
in version 5.1.1 the malaysk ROM was faster But there is still a radio problem in ROM 4.4.4 ، 5.1.1

Any good custom roms for the Xperia S?

Hey everyone it has been a while (legit like 10 years later but who cares anyway)
I'm kindly asking anyone who has links (that aren't dead) for roms that are on android version 4.4 thru 8.1. I still have my xperia S lying around and it currently has chromas 5.1.1 from currently installed but since android 5.1 is buggy and slow for me. I wanted to try out to use android 4.4 again since its been a while since I've used a phone with android KitKat (my galaxy s4 is running android marshmallow).

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