It’s frustrating to see new members come on to this forum and expect others to get BS running on their old Macs without apparently doing the hard yards first.
Most, if not all of their problems have been solved by others in the preceding 142 pages and 3.5k posts. Therefore, like me and hundreds of others, start from page 1 and take the time to skim through every page. Take notes; copy and paste sections relevant to your model and/or year and print them out; start to experiment with patches. Keep records of what you did and what worked and what didn’t. All of this expands your mind and knowledge!!! Use it or lose it.
I’ve probably reinstalled the 5 betas, as each was released, several times over and rebooted in and out of recovery on a USB installer stick more times than I remember - but you learn and hopefully retain a bit more each time in the process, incl. repetitive lines of code in the Terminal. I now have the latest BS beta screaming along on my 2010 Mac Pro, with everything I need working and appreciate everyone else for helping me get there.
So, for those finding this forum for the first time or only intermittently, please put in the work before filling up the forum with IMO often unnecessary requests.