[ONE Q&A, Help & Troubleshooting] Planterz:
I haven't used my OnePlus One in several months since I got my Nexus 6. I've been meaning to sell my OPO, but got lazy about it. Now I can't be, and I need money for rent. A friend/co-worker who's in serious (in my opinion) need of a new phone wants to buy it off me.

My OPO was on LiquidSmooth 4.4.4 but obviously it's out of date, so I tried to update it. I tried once before to update it with a 5.1 ROM, but it kept failing. I remember there was something about the firmware or baseband version that needed to be flashed to go from KK to LP, but it was several months ago, and I can't remember what exactly it was. And for the life of me, I can't find it.

I tried to find what it was, and in my searching I found that CyanogemMod Official 13 had a built-in baseband updater. So that's what I tried. TWRP version was/is 2.8.7.0. Maybe that was the problem?

Anyway, CM13 (the most recent snapshot) installed, seemingly fine, but it won't recognize my SIM card. I try reinstalling it, and it still won't recognize the SIM. Moreover, it doesn't even detect a cell signal (it should, as all cell phones in the US are required to have 911 emergency access, even if you're not actually paying for phone service). And then it starts rebooting. Not a bootloop, because it boots. Then a few minutes later, it reboots. Continuously.

So I try a different ROM. The latest Resurrection Remix (I have it on my Galaxy S4 and it works fine). Same thing.

The even weirder thing is that I figure I should just restore my latest nandroid, but it's not there. In fact, nothing's there. Nothing visible through TWRP's file manager or backups. Not even old pictures, which I didn't delete. I didn't delete any storage (because I wanted my backup, just in case, duh). But TWRP still shows that there's 26GB available. So obviously, there's something there. I just can't see it. My fault for not saving the nandroid elsewhere, but Humpty Dumpy has already fallen.

I have Wugfresh's toolkit (yeah, yeah, I know...), and tried restoring it to stock, and it won't do it.

I've used ADK in the past, but it has been way to long for me to remember specifics, and it has apparently been updated with the newer Android versions. Obviously, I've looked at the sticky thread about restoring your OPO to stock, but it hasn't been updated in a while. So I'm worried about using those instructions. I've looked up youtube videos, and they're all too old as well. I'm also worried that I'd be using the wrong version of ADK. I'm not scared of using ADK, as long as the instructions are correct and clear. I'd be using Windows 8, if that matters.

So what I'm asking (begging) for is instructions on how to make this phone work properly again. Quickly. I've tried doing the research myself, and haven't found my solution. I'd keep at it, but time is getting short, and I can't afford that. Literally. I can't afford the hours spent (it's 1am and my the office closes at 4pm), and I can't afford being late on my rent. A couple weeks ago I spent way too much up in Phoenix to go see Guns N' Roses (at least I got a kickass T-shirt). Entirely my fault. Also my fault for not realizing how desperate my financial situation was about to be, and for waiting to ask for help until now. And I'm not going to ask to borrow money. I just can't.

Finally, and I know it's taboo to ask "what's the best ROM?", because I've answered that question myself with "there isn't one - try them out for yourself and find which one's best for you". But as I said, I'm out of time., and I haven't been keeping up with what's going on with OPO's development. My friend is not like us. His phone's a LG cheapo POS from years ago that's on 4.1JB. He uses it for calls, texts, and podcasts. He doesn't need root, or even custom recovery for that matter. In fact, I'd prefer if it didn't have root (although custom recovery might be nice, just in case). So if I can get this damn thing working properly again, what'd be a good ROM for my firend? OPO's official Oxygen? Are they still updating it? Stability is the primary concern, but if there's something that gets regular (and stable) updates, that'd be good too. With an updater that's built-in, simple, and wouldn't need and XDA forumite to do it for him. Because it'd be nice that he could get updates with Google's security patches. But since he's still using a 4.1 phone, he's obviously not all that concerned about that issue. But still, that'd be nice.

Thank you (fingers crossed).