I downloaded android-x86-9.0-r2.iso from https://www.fosshub.com/Android-x86.html and installed it on my old IBM Thinkpad x40 without error. After rebooting, it said 'Operating System not found'. I tried to boot manually by selecting boot partition with no luck. I also tried to run it without installation but it keeps rebooting. Is it because the hardware is not supported, or I should download from other sources? Thanks.