if you haven't noticed i did this again yesterday and updated post one.
Do over the air android update. (Full)
Do over the air linux update selecting 'int"
Put your mac code on a usb called mac.txt
Go into live tv. Setup. Misc. Prefs.
Select use e2.
Write mac code.
Reboot box.
Download or use backup image of openatv.
The root folder needs to be your box name i.e dinobot. Not the backup date. Not the u5 or what ever is inside it. It is that dinobot folder and its content that go on usb.
Use the rear usb port
Turn box on off. On menu press green so update shows on display.
I personally just pressed green, followed by pressing ok repetitively slowly.
Flashing screen with progress should appear.
Not all usb sticks work when flashing boxes.
If one doesn't work after several attempts. Use another.
And make sure you use a good brand geniunie usb stick.
Someboxes used to have an issue with the file size of the image. It had to be a max size of around 120mb. I notice latest opnenatv 6.3 is around 140mb. Try openatv 6.2 instead which is smaller