Hello all,
The thing is, I am not sure which chip is the real kickstart on A500. do you have a picture of motherboard which clearly shows it?
http://amiga.resource.cx/photos/photo2.pl?id=a500&pg=1&res=hi&lang=en is decent image... left hand side next to the CPU with numbering "315093-01" Don't quote me but I believe -01 is 1.2 ROM and -02 for 1.3 ROM. The swap should be simple enough - I put kick 2 in my 500 without any prior experience and it's working!
UPDATE 1: OK I found this image. Which one is the Kickstart ROM chip?
http://www.freemansgarage.com/stuff/P1010006.JPG
cant see the chip in that pic but the socket has a ribbon cable coming from it to what I assume is a kickstart switcher.