I have an older version of the TIU (4.0) I believe. I have never tried upgrade. I have serial to usb cable and the mini stereo cable. Now I want to upgrade to 6.0 so I can use Wi-Fi. I want to use DCS remote also. If my understanding is correct, I need to first down load the loader program then I can go direct to 6.0 skipping 5.0 or do I have to load every change since 4.0. Then I transfer these files to TIU/DCS. I must say clear instructions are sorely lacking from MTH in this subject. Unfortunately, I am 500 mi from the nearest MTH repair or dealer, so I am turning to the forum for help. Wish I had been able to travel to York but that is 2000 mi. Thanks for your help.
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