That looks like a clone cart.
Which revision is your R4i Gold 3DS?
Come to think of it, my cart label didn't have "RTS" printed on it but still supported RTS anyway. The chipboard had "9" printed on it but the Wood menu identified it as revision A. My cart is not supported by NTRBoot Flasher or its alternatives.
Edit: Just saw your post with the photos, looks like you have revision C. Odd, I thought all revision C carts would have RTS on the label? Internally your cartridge looks identical to the ones with RTS on the label, it's possible that the manufacturer used the wrong label or something.