First Mazo, thank you, but I found another one called balenaEtcher, and AFAICT it works. The only problem is I got to add Sega Swirl Gmail email info and maybe (not sure because the Dreamcastic video says the info is for USB based Wi Fi devices, not Ethernet based ones) either getting my WiFiPi running and/or setting my DMZ settings.
What makes the DMZ hard is the some models of the Frontier Netgear 7550 have DMZ and another feature switched, and some do not, Plus I don't know what feature it's swapped with. Add to that the Frontier does not do technical support without charging for gaming devices, and there is no more 1-800-USA-SEGA for SegaNet.
Finally a question about DreamPI and Apple command line. I believe Terminal is the command line form of OSX, which uses Unix as a root and builds upon it. I would be probably less likely to make mistakes if I can transfer the WiFiPi and Swirl Gmail information using the Macintosh. 99% less likely to cause typos.
Also let's use the convention of white text as literal text to copy and paste verbatim, and red text as placeholder text where I have to replace it with some variable text. If more people used that standard, then learning coding would be easier, instead of trying to figure out what needs changed,and what MUST stay there.
Can those 2 files be dragged and dropped in via GUI directly, AND THEN FROM THERE be manipulated by Terminal? is there a slightly different code working from a Mac to the boot SD vs directly on the Dremapi via the HDMI?