If it's working well with no issues, you should be fine to continue flying it as is. If you start experiencing problems, you may want to seek out a friend with a PC so you can update the firmware.
I just got a smokin deal on a new typhoon G with the gopro gimbal. The gopro works well, but I'm not a big fan of the fisheye lens affect. Is it possible to buy the gimbal & 4K camera and simply swap it out to make it the typhoon 4k version?