The FireBrick SoHo and Plus, the FB105, the FB2700 and FB2500 are the predecessors to the current FireBrick 2900.
In service from around 2006, software. Looking similar to the older SoHo/Plus model, but with 100Mb/s Ethernet ports. (Quickstart guide)
In service from from 2000, our very first model. Back when ADSL was 2Mbit/s