Thanks Firegun. I'm back on 4.1.06 but it looks like I've toasted DIO 0 & 1On the Netduino you need to do the same you´ve done to put the new firware on it, just upload the desired version, the step are the same. On the VS2010 you just need to select the .Net Micro Framework 4.1 as your target framework (right click on the project, Properties -> Application -> Target Framework), it will as to reopen your project after you change that, and it´s all back to 4.1.
Hope it helps!
I'd just got into bed and was tablet surfing when I read your reply, got up, rugged up and now back to where I was last night (minus COM1).
Only have the 1 N+, local suppliers don't have NGO yet and out of stock of N+.
I was going to use both COM ports as I just have the Arduino monitoring the Solar Hot Water system working and I was about to engage in another Arduino to monitor the wireless Weather Station (Practical Arduino style).