Just to give everyone a better picture. Right now i have 3 magix processors, 2-r4.7 and a r1.7. the rack i bought came with the r1.7, an 024 tdl, 2-800 gs/ls-id, and i added an 016 MLX since all the phones we have r mlx. Well i ordered 5 for the 024 tdl. If i use the processor that came with the rack, which i bought second hand, everything seems to work fine. When i swap out for a newer processor, that's when i have problems. The processors either go directly into an error with the red light on, or when using WinSPM, it says unable to recognize modules. My questions are could the other modules be non compatible? Is there any particular order the modules should be in? And finally, since the original processor seems to work, is there anyway to flash or update that processor? I really appreciate everyones help. We r a volunteer fire company and funds are tight so we r doing whatever we can to fix this system. However, i am starting to get frustrated.