K26RT-AC – MIPSR2 – SDK6.x, special builds for RT-N66U, RT-AC66U, R6300v1 and Tenda W1800R only.K26RT-N – MIPSR2 – special builds for E4200, RT-N10U, RT-N12B1/C1/D1, RT-N15U, RT-N53, RT-N66U, WNR3500Lv2 and newer Linksys E-series routers.K24 – Kernel 2.4 – ND builds, MIPSR1 – for older Linksys WRT54 series, Asus WL500GP and Dlink DIR-320.
