Got a message that my P4 needed an update. I have a windows 8 computer that has DJI Assistant 2 installed. Hooked it into the P4 USB port and started DJI Assistant 2. Signed in to my account, it found the P4 and showed a listing that said an update was available, at the bottom of the screen, so I click on it. It then ask, on top of the screen, if I wanted to roll back to a previous version or update. I choose update. It said downloading, then installing and then failed in red! Tried it several times and finally got a message that it had been updated to version 1.1.410. Now several things have happened to a perfectly great working P4! In DJI GO it says "Air Encoder Error" followed by 0x800020, restart and if error reoccurs contact DJI Support . DJI GO says Disconnected, in the upper left corner, and there is absolutely no incoming picture on the screen. I removed the memory card to see if there was something on the log, and found that I could not read anything on the card, it is not recognized by any computer, so no way to read what may be on the card. So I guess my 64GB Micro SD card has been trashed in the process, sure glad I saved the pictures and videos off of it yesterday! Where did I go wrong! Did exactly what I was told to do, followed by what seems to be a disaster! Your thoughts and ideas will be appreciated, before I contact DJI for further instructions.