membalik layar dan raspberry Pi

1.Run this command

sudo nano /boot/config.txt or sudo leafpad /boot/config.txt

2.on the last page write this command

display_rotate=0
display_rotate=1
display_rotate=2
display_rotate=3
3.if the File can't to be saved, please write this command
sudo -i
cd /etc
cd network
nano interfaces                or leafpad interfaces
# save the file in nano
# exit nano
reboot
4. try again to save a file boot/config.txt
5. sudo reboot