In this video, I show you all how to go in and update your firmware on your AR7200BX. The process should be the same for the AR7300BX as well as on the original BeastX gyros.

You will need the USB link that is sold separately to update your firmware. You can purchase the USB link in the link below.
http://www.horizonhobby.com/usb-interface:-ar7200bx--ar7300bx-spma3030

Once you have your USB link, you are going to need to download StudioX. Make sure if you are using Windows, you download the Windows package. If you are using a Mac (Apple), you download the Mac software. You can get either of those in the link below. The driver for the 3030 USB link is also in the download and you can get it after you run the program.
Spektrum AR7200BX and AR7300BX firmware update

From there, just follow the instructions in the video below.

As always, if you have any questions, comments or suggestions, please post them in a reply below.