I think he was asking whether OS4 is supported by the KickFlash, not whether AfA is supported by OS4. HammerD, I'm afraid I have no idea since I can't run OS4. Why not just try it and report back in the hardware forum? You can't do any harm to your Amiga or KickFlash. If the OS4 ROM is not compatible with the KickFlash, one of three things will happen:
1. CoyoteFlash won't let you add it
2. It will be added, but nothing will happen when you boot
3. It will be added, but the Amiga will show a red screen on boot - don't panic, just write-enable the KickFlash to stop it kicking the ROM image and then remove it