I can confirm that it is possible to convert a TDS744 to a TDS784A. and from firmware v1.0e to v4.2.1e. the first time it didn't work and I had a mismatch with firmware verification. that probably had to do with the fact that the firmware erase did not go well right away and had a few retries. I continued to repeat the firmware removal process until everything was 100% removed at once without retries. then load and check the new firmware. I did everything with the tektool. and the correct order was followed. Please note that a full calibration is required due to firmware upgrade and bandwidth.everything of course at your own risk. If you want more information let me know.
