have a Sony KDL-70W850B TV that had issue with TV not turning on then off with blinking red light. I diagnosed that it could be the t-con board and replaced it. When I turn TV back on, after tcon board replacement, it now blinks Amber and Green which I know means it needs a firmware update. Make sense being that I changed out the t-con board. The problem is there is no display and I don't know how to do the update. I have a USB drive with the update in it plugged into the TV as well as it being hooked up to the Internet. I have waited 20 minutes plus and still blinking Amber and green. Have tried starting over a few times. Have tried holding the arrow up button, starting the TV while holding that button and then pressing the power button to no avail. I believe I fixed the problem I just need to do the update. Please help! Thanks in advance.