Hi, I'm a brand new member. I updated the firmware from 1.3.2 to 1.4.0 on my phantom 3 professional and have nothing but grief. It worked fine with 1.3.2, no issues. I may have updated successfully the first attempt, the text file read success. However, I had issues with the video feed, video was distorted, so I downgraded firmware to 1.3.2. Immediately I got a very loud siren like sound from unit for about 30 minuites. Since that time I have had no success after doing numerous down grades and upgrades. I have turned RC off each time, downloaded new bin file each attempt, tried numerous SD cards, formatted each attempt, left in unit for over an hour each time. Here's what happens: 1. unit give 3-6 beeps for a few seconds, Camera Status Light flashes Green. 2. Within 10 seconds Camera droops. 3. I have left SD card with v1.4.0 for up to 6 hours and NO Green solid Camera Status light. 4.I put SD card back in computer and NO TEXT FILE shows at all. 5. I have attempted this at least 6 times with upgrades and downgrades and the results are always the same, NO SUCCESS!!! Please if there is anyone out there with suggestions.