MacOS users BEWARE!! I just bricked an A7RII ILCE-7RM2 trying to update from 4.0 to 4.01 using my MacBook Pro with Catalina 10.15.3 VERY CAREFULLY following Sony's instructions. I had updated this camera with this computer but an earlier OS successfully in the past. About 1/3 way done, the camera just disconnected from the computer (volume disappeared from desktop), the little red light would not go out, and the camera would not reconnect. I tried pulling the battery. I read where some folks had to run the update more than once, but I couldn't run it again on the Mac because the Mac would not mount the camera as a mass storage volume. The reason I am not really upset is my wife has a desktop PC, and even in this messed up state, the camera responded to the Windows updater and is updated and running.