I didn't had any errors during burning.
The backlight is lit up.
Since I bought a M5Gray also, I recognisize the sound on the Fire as the sound of the Rock-Paper-Siccors game which is the default app.
LCD doesn't work
After recieving my M5FIRE I was exploring this by pushing some buttons.
Doing that, the external battery fell of (it's just attached by small magnet) and after that I never get a picture on the display.
During startup the LED's and sounds (when pushing buttons) work fine. So there is only a problem with the display.
I did not connect to anything yet.
After investigation, I decided to download the Serial driver and the M5Burner.
I could make a succesful Erase and burning of the new firmware.
After that the situation stay the same.
Does anybody have an idea to solve this?