I have an Echo also. TFR around MHT on Sunday never showed up on my 740b. Traffic and weather were fine.
My iPhone was also running iFly and connected to the Echo - TFR showed fine on that (although I can't be 100% sure that didn't get to the phone from internet. I plan flights on desktop at home, share to my phone then from phone to 740b when i get to the plane).
Pity the TFR's didn't share when I shared the flight plan, that would be a good fallback and get them into the 740 even without ADSB.