To summarize:
1- Flash the E3000 Trailed Initial Flash Build, as explained in steps 1-10 of the wiki
2- It is suggested not going farther than build 18000, for now. Following steps 11 to 19 in the wiki:
a) Flash dd-wrt.v24-18000_NEWD-2_K2.6_mini-e3000.bin
followed by:
b) Flash dd-wrt.v24-18000_NEWD-2_K2.6_mega-nv60k.bin