DougD did you ever get 3.4b working? I am still having the same issue with it. Also does anyone know if there is any newer firmware than 3.4b and what's the max 2811 pixels people have been able to get running per port on a p12s. Been knocked down with pneumonia for the last two months so I am just now getting around to the display this year.
Hey Chicken, I went through the whole 3.4b process and it didn't work, so I went back down to 3.4, this works perfect for me, I am running multiple Universes with it, pretty sure my highest is P01: Universe 1 = 136 Pixel & Universe 13 = 130 Pixels, so I total of 266 Pixels from Port 1 on my P12, I know I also have another one with 200 Pixels, my while setup is done with just my P12s.
I have 4 P12's and managed to get them all updated to 2 x full universes and I did test the full setup when I did it. So I had the full 340 pixels running. At the moment I am running 300 per output for my mega tree and it is running fine.
It was at the start of the year when I updated so my memory is a bit fuzzy, but I followed the instructions and it worked on all of them. I did have dramas at the start purely with not doing things correctly and in the correct order also for finding what chip I had and using the correct files.