The Amiga 1200 originally shipped with Kickstart 3.0 and when Amiga Technologies began shipping the Amiga 1200 in 1995, the Kickstart supplied had been updated to Kickstart 3.1. To upgrade the original machines is simply a case of extracting the old and fitting the new ROM chips.
So firstly, we need to take the lid off of the Amiga which is straightforward enough by unscrewing the 5 case screws. The case also "clips" into place along the back edge so it must be levered off gently to open up the case completely. At this stage, you can if you need to unplug the header connector that connects