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Lineage-23.0-20251201-NIGHTLY-pro1x with November 1st security patch installed smoothly via OTA. MindTheGapps16, and root was maintained.

The base kernel source is of course available as per the GPL2. Also, e.g., the keyboard-driver source is available as part of LineageOS. However, much of the device drivers that make up basic mobile-phone functionality are not. The project of mainlining the Pro1 got stuck on such profane things like the touchscreen driver requiring some non-disclosed firmware magic to be usable in the first place. Device drivers not being open-sourced is pretty standard in the Android world, though. Nothing specific to the Pro1 here. 👎

I think that for an OS like Lineage, which is supposed to be just Android-without-the-Google-bits, upgrading the major Kernel version will be next to impossible. The proprietary vendor blobs compiled for 4.4. will not load with 4.14 or later. That's just not how Linux works. Yes, there may be some other ms8998 devices out there using later Android kernels. So it may boot somehow. But what's the good of that if your LTE-modem, camera, and touchscreen no longer work?