I have searched quite comprehensively and I cannot find any definitive reference material documenting Raspberry Pi 4 support (or why its not supported).
The most recent posts I found were from January 13th - over 3 months ago. THose posts were less than usefl at determining support status.
Does IPFire run on Raspberry Pi 4?
If not, will there be support for RPi4?
If not, why not?