If not ask the people behind the software for a compatible version. So in case of trouble try using the latest Raspbian from the download page, or try updating your older software on an earlier PI on which it boots, with Raspbian that should work. If you use the PI3B+, note that it will only boot past the 'rainbow screen' if you feed it the right (latest) boot files. This post will talk you through the potential causes of your boot problems, and will offer some solutions.
If you are reading this, you are presumably having trouble getting your Raspberry Pi or Pi 2, PI3(+) or PI4B to boot. If you have a PI 4B or RPI400 that won't boot, please read the PI 4B/400 specific fourth post in this thread, before continuing here. If you have a PI Zero that won't boot, please read the PI Zero specific third post in this thread, before continuing here.
