I just went to www.dd-wrt.com and did a quick scan of their firmware and the results are a bit spotty but possible for some types of routers. But if your router is on the list then I'd get the hell out of the Belkin umbrella altogether. Might wish to check out Tomato, OpenWRT or FreeWRT too. If your router isn't upgradeable, smash the fucker in a fit of rage (it'll feel good, I promise) and after you collect enough empty bottles, go buy yourself a new one that isn't made by Belkin and IS on on of these firmware upgrade lists.
Manufacturer Model Revision Supported Activation required
Belkin 7230-4 v6000tc not possible no
Belkin F5D7130 - yes no
Belkin F5D7130 ver 2001 yes no
Belkin F5D7130-4 v1010 yes no
Belkin F5D7130-4 v1112 yes no
Belkin F5D7130-4 v7002uk not possible no
Belkin F5D7130uk v2115uk yes no
Belkin F5D7130uk v3000ef, v3002uk yes no
Belkin F5D7230-4 1000fr, v1444, v2000df yes no
Belkin F5D7230-4 v1000, v1010, v1111, v1112, v1222de, v1223df, v122 yes no
Belkin F5D7230-4 v2000, v2000de yes no
Belkin F5D7230-4 v3000 yes no
Belkin F5D7230-4 v6000/v6002 not possible no
Belkin F5D7230-4 v7000 not possible no
Belkin F5D7230-4 v8000 not possible no
Belkin F5D7230-4 v9000 no no
Belkin F5D7230-4 vA000 not possible no
Belkin F5D7231-4 v1000df, v1000ef yes no
Belkin F5D7231-4 v1001 yes no
Belkin F5D7231-4 v1100de, v1102, v1103ee yes no
Belkin F5D7231-4 v1212UK, v1213 yes no
Belkin F5D7231-4 v2000, v2001yy, v2001df yes no
Belkin F5D7231-4P v1000 yes no
Belkin F5D7330 - yes no
Belkin F5D8230-4 v1001ea yes no
Belkin F5D8230-4 v1002 no no
Belkin F5D8231-4 - no no
Belkin F5D8232-4 1000, 1021uk wip no
Belkin F5D8233-4 ? not possible no
Belkin F5D8236-4 ? not possible no
Belkin F5D8633-4 v1 no no
Belkin F6D4230-4 v1000 not possible no
Belkin F7D3301 v1 yes no
Belkin F7D3302 v1 yes no
Belkin F7D4301 v1 yes no
Belkin F7D4302 v1 yes no
Belkin F7D7301 v1 yes no
Belkin F7D7302 v1 yes no
Belkin F7D8301 v1 yes no
Belkin F7D8302 v1 yes no