Hello,
The newer builds don't seem to work due to some glitch. You can use build 16214 which has proven to work. The firmware is listed in this directory: http://dd-wrt.com/site/support/other-downloads?path=others%2Feko%2FBrainSlayer-V24-preSP2%2F2011%2F02-17-11-r16214%2F in the folder corresponding to your router model.
