First of all, yes I have gone through droves of posts on XDA and frankly it’s a mess, but I can tell you that after following a few threads that just refer to themselves in loops, there’s no actual solution.
I have an LG US730 which was rooted and everything was great. I must have toggled something in SuperSU - I think maybe the option to be rooted during boot.
Anyway, now all I get is Security Error and it shuts off. None of the recovery power on switches will work. The only thing I could do is VOL+&- power while the usb is plugged in and it goes to a download in progress screen. Of course nothings happening and I need to remove battery in order to get this powered off at this point.
Anyway, I’d love if anyone has a tool to repair this. LG’s utilities all do nothing at all I think they’ve purged the back-end of older stuff so the programs that should download something and proceed simply wait forever.
Hey, So... after a lot of exhausting searching and attempting to get the tools, looks like EVERY one of these is defunct. Either dead links, or updates have since patched out the ability to do whatever is needed. I feel like Lineage is a short-lived option where the only practical route is to buy a phone that they officially support right now (as in, when you want to do it). I have also searched beyond your recommended links... A LOT. Dozens and dozens of youtube tutorials, XDA threads, and other websites. All with the same flashy "INSTALL LINEAGE ON zzzzz" and ALL dead. Missing files. Or comments by the hundred saying it fails. Or youtube videos that just want the fucking clicks so what they do is not actually possible; therefore they just use some kind of video trickery to leapfrog over one essential step that will actually not be possible.
Anyhoooo.... What I HAVE been able to do is find lots of great rooting tools and threads so I have rooted like half of my phones lol. Also gotten some great tools to optimize even without rooting by using ADB and strip/disable lots of stuff that's just bloat.
I still would love someday to explore Lineage, /e/, Havoc, and many other custom ROMS. It seems, though, that for every legitimate tutorial, there are a hundred that are just clickbait, or more recently the cancer that is AI bot copied SHIT. AND, besides all that, lots of the tutorials have dead links so whatever ROM they were hosting is not there anymore. The official sites remove versions that they no longer support, so even if you want to just take a risk with an unimportant phone, you cannot even get what was once an official build!
Some day, I will try again when I have plenty of free time, but for now I guess I am sticking with whatever is there already and just customize the shit out of it, plus root where possible.
Thank you for your efforts, though, it was appreciated!