Bob,
I have the same issue, no transform button. I took the leap today and upgraded my nanovna of unknown pedigree. I used this as a tutorial.
In the first sentence, there is a link to a ¡°nanovna firmware guide for idiots¡± Which I followed step by step. It took me about 20 minutes to read thru the guide once and then a second time when I actually executed the steps. It worked the first shot for me And I now have the new features.
Dallas, N5fee
