Hello,
With DD-WRT build versions from 22118(or 21676) are supported.
Please try these builds:
http://dd-wrt.com/dd-wrtv2/downloads/betas/2013/07-24-2013-r22118/broadcom_K26/dd-wrt.v24-22118_NEWD-2_K2.6_mini_hotspot.bin
http://dd-wrt.com/dd-wrtv2/downloads/betas/2013/07-24-2013-r22118/broadcom_K26/dd-wrt.v24-22118_NEWD-2_K2.6_big.bin
http://dd-wrt.com/dd-wrtv2/downloads/betas/2013/07-24-2013-r22118/broadcom_K26/dd-wrt.v24-22118_NEWD-2_K2.6_mega.bin
http://dd-wrt.com/dd-wrtv2/downloads/betas/2013/07-24-2013-r22118/broadcom_K3X/dd-wrt.v24-22118_NEWD-2_K3.x_big.bin
http://dd-wrt.com/dd-wrtv2/downloads/betas/2013/07-24-2013-r22118/broadcom_K3X/dd-wrt.v24-22118_NEWD-2_K3.x_mega.bin