Install Shibby Tomato firmware on Asus RT-N66W router

For the most part, I followed instructions in this guide: How To Flash Tomato on the ASUS RT-N66U

Here are my exact steps:

1) Download and install the Asus Firmware Restoration Utility.

There was no download link on the RT-N66W support page, so I went to the RT-N66U support page. Here is what I downloaded:

ASUS RT-N66U B1 Firmware Restoration version 1.9.0.2
OS Support: Win 2003 / Win XP / Win Vista / Win 7 / Win 8

2) Download Shibby Tomato image file.

K26RT-AC is the version that works with RT-N66U and RT-N66W (and RT-N66AC as well). I installed the "AIO" (all-in-one) version which has all the features. There was also a "VPN" version that I'm guessing has only VPN. The exact file I downloaded is tomato-RT-N66U_RT-AC6x--115-AIO-64K.trx.

3) Continue following the steps from the guide:
  - turn off router
  - connect it directly to your PC
  - open the Firmware Restoration program and browse to the firmware image file you downloaded
  - hold reset and turn on router to put in rescue mode (it was not obvious to me that this step worked, since the "blinking" was not very fast, but everything worked out so the instructions must be correct)
  - turn on router
  - click "Upload" in the Firmware Restoration program

4) After the progress bar hit 100%, I got the error mentioned in the guide:

"Failed to connect to the wireless router. Check if the router's power LED is blinking, which denotes that the router is in rescue mode."

5) I kept waiting even though it seemed like nothing was happening and after ~15 minutes, the wifi lights (both 2.4 and 5 Ghz) came back on.

6) I skipped NVRAM clear steps in the guide and logged into the router at 192.168.1.1 (default login is root/admin). However I tried to change a setting (disable DHCP) and got an error "the field wl_key is invalid". Oops.

7) Clear NVRAM by: turning off router, holding WPS button and turning on router, continuing to hold WPS button for 30 seconds, releasing WPS button.

8) Tried to disable DHCP again and this time it worked! I have Verizon FiOS so I'm using the router as a secondary (a switch essentially) so I changed the following settings
  - gave the RT-N66W router a static ip in the Verizon-supplied router
  - changed the RT-N66W router ip to the chosen static ip
  - disable DHCP under Basic->Network->WAN/Internet->Type
  - disable DHCP under Basic->Network->LAN