First of all im new here and not sure if this is the right place to post this but hopefully someone can help me out

I recently bought a Mazooma Club Rolling Thunder Fruit Machine its currently on 25p play £250.00 Jackpot now i got a dip switch that connects in to the connector located in the upper area where the reels are on the chip board to the left side of the machine when i put this in its saying invalid stake / jackpot key and asks me to set it so i select £75 Jackpot and 5p play which the sticker states beside there is connects to and i find on free play it goes down 5p and also when i stick £1 in it also goes down 5p but when i close the upper door it says stake key error 17 so i remove the key and close it again but it just goes back to 25p play £250 Jackpot how do i set this to stay £75 jackpot 5p play as i been trying everything

Thanks in advance for any help on this issue