Image doesn't work with Raspberry Pi 4B (4gb)

[HardwareHarry]

When the image is flashed to a fresh microSD card and inserted into the Raspberry Pi 4B 4gb and power applied, the red PI LED remains constant and the green LED flashes 4 long flashes, followed by 4 short flashes, which according to Raspberry's documentation means "Unsupported board type". I tried the alternate build instructions but they don't seem to work with TTN v3 and are an incomplete implementation compared to the pre-built image (no web UI for example), though a fresh OS install does allow the Pi to boot correctly.

Please can the image be updated, the instructions to build your own image updated or the board marked as obsolete and unsupported as it doesn't seem to work with current Pi models and the current TTN.