Modern controller configurations often map turbo or rapid-fire functionality natively. If rapid-fire is active, the game reads the "A" or "B" inputs as continuous stuttered presses, instantly ruining the code sequence. Disable all rapid-fire toggles before entering the title screen.
Change this value to 1D (which is the hexadecimal representation of 29, yielding 30 lives in total). super contra s power 30 lives nes fix