1.Drag and Drop update firmware.bin won't work on Mac and Ubuntu.
PS.You need to use "Terminal" program do use "cp" command. or Follow the screen shot!
2.No matter what filename you drag in, next time it will show "Firmware.bin"
3.If you delete the "Firmware.bin", next time it still will show up "Firmware.bin"
(You cannot really delete the file)