

Looks like it is partially supported: https://wiki.postmarketos.org/wiki/Nokia_Lumia_520_(nokia-fame)
I have a Lumia 635 and got tmpfs to start, but then I am lost at “locate your ramdisk” https://wiki.postmarketos.org/wiki/Nokia_Lumia_630_(nokia-moneypenny)







AFAIK, custom ROMs ask for specific OS to get specific firmware for some peripherals (modem, WiFi, BT, etc).
E.g. installing Ubuntu Touch on Nord N10 5G requires a downgrade to OxygenOS 10 using the official tool, which (i believe) installs original firmwares.