to answer your question: watch the terminal in the lower right when you start webcontrol and it should tell you what firmware version is on your mega. When the usb connects, the mega reboots and at each initialization it reports its firmware. You can force a reboot by unplugging and replugging in the usb, but don’t do it when the sled is moving. In Webcontrol, you can click help->logs. look in the right side for firmware version.
51.27 was the version that ships with webcontrol. you can manually change it by copying the 51.28 hex file into the holey folder and then restart webcontrol… instructions here
Remember if you have an eastbay 1.5b shield, you need 51.29.
51.29 isn’t in a new release of webcontrol because I can’t build distributions of webcontrol for windows or linux, only raspberry pi and the full testing of it has not been completed. I’m running beta code having built it only for that platform. All the developers of webcontrol are waiting for the next version of makerverse to come out and so it may appear nothing is being developed, but that is not the case.