I tried to update my Amplifi 75 and it did not work. I held down tap and down while turning the unit on and let go after I heard the pop. I hooked the unit up to my PC with a USB cable and launched the Amplifi Utility. I selected the latest version 2.10.00 and click install and after it started it said "Downloading Firmware Update" for about 1 second until it switched to "Installing Firmware Update". That seems suspiciously short for downloading a firmware update since I thought I saw somewhere that it is several hundred MB in size. I let it run overnight which did not work. The unit just sat there with the 4 A/B/C/D lights constant on and the progress bar in the utility didn't move at all. I tried to start the install again but couldn't get the pop to happen when turning the unit on as previously mentioned but was able to restart the install via the app with the same results so far? Any ideas on this? I guess I could try via my phone?