Excellent step by step and very detailed and easy to follow.
One thing that happened to me (step 10) when upgrading the bird... got the beeping, camera led green/red, but about 3/4 or the way through all of the lights on the arms went out.
The beeping continued and the camera led kept flashing so I just continued and about 3 minutes later the arm lights came back on and finished just fine.
Just a little anomaly that happened to me, IF you want to add that to the possible indications.
Once again, thanks so much for this guide!