@jebez0 I have ALARM flashed on mine, but I'm not using a microSD card.
Tauchgang isn't *mine*, it's just a community u-boot version that is focused on mobile devices.
If you just want it to work, you can generate an image on my website. However there's a good bit of work still left to be done for ALARM.
@jebez0 DanctNIX (dremurrs-embedded) does not support the Fairphone 5. My repositories just add packages that are necessary to support it.
I don't know if a microSD card works, I never tried.