[LG G7 ThinQ  Questions & Answers] Stupidaso:
So, I have an LG G7 from a couple of years ago that came with G710ULM11g (BPT). And unless the phone manufacturer itself disables unlocking the bootloader, 99% of the phones my carrier offers are unlocked versions (ive been able to easily root every phone from them for years except for Samsung phones recently, they suck.) But After getting a different phone, I rooted the G7 and flashed it with G710ULM21f (BPT) stock rom. No problems. But i just recently accidentally smashed the LCD screen on my new phone and its unusable at the moment and I cant afford to fix/replace the screen currently. So, I took the SIM out of that phone and put it into the LG G7 and noticed that the antenna bars only displays "1x" next to it. So, I went on a deep dive researching spree the past few weeks to see how I could get the phone receiving 4g/VoLTE like it used to. After hours and hours of research and reading and re-reading xda threads, reddits, posts on other android forums, blogs, and watching countless videos, I still haven't figured it out. I tried changing the APN settings, changing LTE Field test settings in the service menu, adding the enabler file in root, and exploring the root files with ADB to no avail. I managed to screw the phone up multiple times to where I couldn't even get 1x though but always figured out how to get it back.

I also came across articles, threads and other posts on the internet from people claiming that once the G7 is rooted that it will no longer be 4g/VoLTE capable ever again. And then I came across 2 or 3 threads claiming that if you crossflash with the correct firmware that you can get 4g/VoLTE back on the phone. And I'm not sure which one to believe. BUT if the crossflashing threads are true then I would like to try it. My problem is that not only have I never crossflashed firmware on any of my phones before, and I have no clue which firmware to crossflash with which but I seriously can't understand some of the steps in the threads that I read. I know HOW to follow instructions and have flashed custom roms on past phones but some of the steps I'm confused on since they're not using terms that I'm typically used into flashing tutorials and I really don't want this phone to get hard bricked. So, if anyone could help me out with which firmware I need to crossflash according to my region while also explaining the steps a little better, I'd appreciate it.

I also came across info stating that some carriers will allow someone's sim to be put into another unlocked phone and it will work fine. While some other carriers activate their SIMs to be phone/imei specific. Now, I'm not exactly sure which of those my carrier does but I'm leaning towards the idea that they're SIMs can be put into other unlocked phones due to the fact that my G7 is technically working with the SIM as in I still get 1x and I can still send and receive calls and texts but I just can't receive 4g/VoLTE. So, I'm thinking that if its real, the crossflashing idea would be the way to go.

I feel like I'm forgetting to mention something else so if I remember it, I'll be coming back to edit/add to this post. But any help would be greatly appreciated!

Thanks!