The announcement of the 4.04 release still exists in the forums here: Framework Laptop 16 Ryzen 7040 BIOS 4.04 Release STABLE
The zip file containing the 4.04 EFI file is on the Content Delivery Network (CDN) here: https://downloads.frame.work/bios/Framework_Laptop_16_Amd_Ryzen7040_BIOS_4.04_EFI.zip
It’s not obvious that you can search for these things in the forum but the historical record survives (for now).