I mean, you do know we're on a forum called hacker news, right?
In most cases it's not some magic voodoo process that you need an LLM for, it's the first result on Google and one command to run or in some cases you just hold two buttons together when booting up and click the unlock button.
Like, I completely understand your perspective and desire to have things which "just work"(I'm in the same boat a lot of the time lately) but like, let's be realistic - rooting an old phone and running some software on it is really not a big deal, I'd hope especially for people on here.