Please do as follows:
- Press Top Left(TL) button to enter to menu
- Press Bottom Right(BR) button to navigate through settings
- Press TL to enter to settings menu
- Press TL to enter Time & Date menu
- Press TL to change Date settings shift to month and date selections by pressing TL
- Same applies to Time settings.
- Press TL to save and navigate back
Let me know if you encounter any problem. I am so happy that you flashed the firmware:) I think problem is in between Arduino and windows 10