Fairphone 3 and 4 have broken bootloaders that trust test-keys for Android Verified Boot: https://forum.fairphone.com/t/bootloader-avb-keys-used-in-ro...

And they have similar limitations to what I do here with regards to firmware support, as they offer longer support than Qualcomm actually does for these chips used.

The only devices with proper aftermarket OS support and five years of updates are the Google Pixel 6 and 7 series.

Sorry for my ignorance, but take, for example, Qualcomm chipsets, which are used in millions and millions of devices. There are 5 main series (2,4,6,7,8), a maximum of 9 generations for a total of 33 variations. I understand that 33 variations are a lot, but don't they share a lot of code? Apple Silicon has, at the moment, 5 variations in 2 generations (M1, M1Pro, M1Max, M1 Ultra and M2), and this number is going to grow quickly. Then we also have MESA drivers, which support, for example on NVIDIA, dozens of GPUs on a variety of architectures. I am getting this totally wrong? Is the effort that much greater than, for example, those projects? Is a Snapdragon 429 that much different from a 630, 665, a 750g or a 845? Apologies for so much text and thanks a lot for your answers!