KBar is a clone of the VBar made by Mikaddo and if they get wind of your clone gyro trying to do an upgrade, they will brick the thing.
IMO, since you are running spektrum, and want to run satellites, look into the AR7200BX. This is a gyro that doesn't need a computer to set up and everything is done on the gyro. Also, on stock settings, this thing is DEAD STABLE!
The Ikon is pretty much the same way, but you MUST have a computer to set it up, or use a blue tooth module and your computer, or your android only phone. But once setup is complete, it's just as stable as the BX. However, the ikon does have self level mode and you must set up SL properly to make it work correctly. We had a member set it up wrong, and it took his Goblin 600 size helicopter right into his house. Lots of money in damage.
And the 550 is not a 500 class helicopter. 500 class has 425mm blades, and yours has 550mm blades. If you look closely, the head actually says "600" on it. It is a 600 frame, head and tail, but the tail boom is shorter as are the blades. Just an FYI so you don't order a 500 size fuse instead of a 600 size fuse.