Just purchased the P3 Advanced. Upgraded RC firmware via the DJI Go app. Followed instructions to download v1.4 to card. Inserted card into gimbal, green light flashed a few times, no sound. Haven't seen or heard sound for 20 minutes. I wondering if maybe the firmware is up to date. How can one determine what the current firmware is on the aircraft. With the P2 you easily find this info using the PT2 app. Any help would be greatly appreciated. Thanks in advance.