Hello,
You should just be able to turn the reset key twice with door closed to get past the miss match error...Also it look like you did not transfer the GALchip (the little one about the GAME erpoms...
Resetting and clearing ram on a Sigma
Hold in the test button next to the power switch, then turn and hold the reset key, then turn on the power switch at the same time. Continue holding the test button and the reset switch until the reels turn and the door says ram cleared (about 15 seconds). The door should read turn reset key twice. This will hard clear the machine
Must have GAL01 or GAL03 denomination chips (Not GAL02)