a null modem cable already has the twist in it , so is the correct cable

you may find the darkman loader may work that is used on the technomates , try it if you wish , or use a dedicated clarke tech loader if there is one

I have the technomate 1500 and the principles are the same for these receivers , but as I said earlier the tps.bin files havent been available for about a week for tps , only for the absat

I cannot help with the rest of your post