Hi Nikhil,
Did the "downloading firmware" message hang up and never finish afterwards?
Could you check if the resistor R55 on the TSW1400 is populated or if this is removed? It is located on the back side of the board on one of the corners of the FPGA pads. If it is populated, could you remove the R55 resistor and try to download again?
Also, which version of the HSDC PRO GUI are you using? We have received similar firmware download issues reported on version 2.10 of the software. We should have version 2.20 of the software on the web on the next couple of days. I will let you know once it is up. It should be up by earliest tomorrow or latest Monday. Could you try checking the R55 resistor first and then update the GUI version to see if this resolves the firmware download issue?
-Kang