Thanks everyone. I tried placing the 1.3 ROM directly into the A600, instead of into the kickswitcher, and it works fine. Perhaps the kickswitcher is faulty, or just incompatible with the ROM. It's odd, because the 2.05 ROM will work fine in either socket of the kickswitcher, but the 1.3 will not work in either. Ah well, the main thing is I have confirmed for myself that this works. I'll just build my own switcher to do the job...