Red light, orange blinking - can't get firmware to update
I replaced the main board on my Sony kdl-55hx820 and now I can't get the tv to work. When I power it up, I get a solid red light and a blinking orange light, which from what I've read means it wants to update the firmware. I downloaded the firmware to a usb (actually tried 4 different usb sticks, including a Sony Microvault stick listed on the sony site.).
The solid red and blinking orange continue for a few minutes then they go off and the green light goes on along with the Sony logo. This lasts a few seconds and then the solid red and blinking orange return.
It does this again.
Then it goes to the red light blinking 8 times.
I try to reset it by unplugging and waiting a minute. Once I plug it back in, the solid red and blinking orange light return and the cycle repeats itself.
I tried to do a reset following the instructions. When I perform the power reset, the red light comes on solid and the orange light is blinking after I plug the tv back in.
I have tried various versions of the factory reset, but always end up back at the sold red, blinking orange.
That then eventually cycles until it becomes the 8 blinking red light.
In one version of the factory reset, I plug the set back in. Holding the up arrow, hit the power button, this turns all the lights off. I keep holding the up button and hit the power button again. Then the Sony logo lights up for about 30 seconds and then a get a green light for a second then back to the solid red and blinking orange. No picture on the screen at any time.
Any more ideas? I'd really like to have my TV back.
Thanks for any help or insight you can provide.