Hi there
Considering that you have had to ask this question - indicates that you should not be in there. You can do a lot of damage to your TV if 'playing' in the service menu.
To actually answer your question, see this post:
https://community.sony.co.uk/t5/android-tv/master-thread-marshmallow-update-amber-green-blinking-led...
Be aware that neither myself, this forum or Sony take any responsiblity if you modify any settings within this menu.
Cheers
