Hi folks, i am feeling like a real fool now. I got a second hand phantom 3 pro. it had an old firmware on it so i thought i would do an update and got the latest firmware 1.8.80. But it looks like the previous firmware was older than 1.3.20 and i failed to make that update first. After going normal for 25 minutes, the Phantom started flashing red and made this weird grinding noise. I waited another 15 minutes and then turned the Phantom off. Thats when i came to this site and read that i should have updated to 1.3.20 first. So i tried that. But it didnt work. The Phantom just makes this grinding noise again and the text file just says it failed and i should try again. does anyone have an idea what i can do?