[OnePlus 5T  Questions & Answers] d u o XIV:
I've also posted this on Reddit and the OnePlus forums, but I'm hoping I can find an answer here, too.

Long story short: I really messed up my phone and I'm looking for help getting it to at least boot into the system. Lots of weird, confusing things have happened within the past few days, so bear with me; might be a long story, but I'll try to give you the abridged version.

I run locked and unrooted. I flashed OOS Beta 3 over 4.7.6 on my 5T, wiped my cache, and everything was wonderful for a week. Then one day, I got a system message saying "Bluetooth has stopped". I cleared that and thought nothing of it, but I got another message saying "Bluetooth keeps stopping". This message would actually pop up (with no exaggeration) every second. I could only stop the messages completely after going to the Bluetooth app and clearing the data, then disabling Bluetooth Scanning.

I figured the problem would fix itself, but the next day when I tried to connect to my car via Bluetooth, my phone would freak out again like the previous day. I had to listen to a CD like it was 1996. I thought I could fix the problem with a Factory Reset. As soon as I hit the Welcome screen, "Bluetooth has stopped". When I went to check the Storage section of the Bluetooth app in the Applications list, the app portion read 0 bytes. What? Even when I went into Settings --> Bluetooth and tried to turn it on, nothing would happen. I thought maybe I should revert back to 4.7.4 and start from the very beginning.

That served no purpose. The Bluetooth symbol did show temporarily in the Status bar as I was setting up my phone, but eventually disappeared, with the Bluetooth app once again taking up a whopping 0 bytes. I've done various combinations of installs, but I cannot get Bluetooth to function normally. And at some point, my phone developed a new problem: any time I hit the Bluetooth button in Quick Settings, the phone would eventually reboot on its own. Later, it wouldn't need any input from me at all. It would just be sitting in the Lock screen and reboot.

Icing on the cake: I got desperate, unlocked the bootloader, deleted the system and cache partition in fastboot, then wiped the data in Recovery with the hope that doing a completely fresh install would fix the problem, but at some point my internal storage got wiped and now I have no ROM on my phone to install. Even better: I'm having some real problems trying to install OOS (any version) on my phone via ADB sideload. I keep getting the message "cannot read <filename.zip>", even though it's in the correct folder.

I am currently back on my OnePlus 3 and the proud owner of a very sleek brick. I used to root and unlock Nexus devices and Moto X's, so I'm pretty embarrassed that I managed to ruin my phone while it was running (basically) all stock. It can still boot into Bootloader and stock Recovery. Is there anything at all that I can do to at least load OOS (or any ROM)? Do I have to send it back to OnePlus and beg for a replacement? Will they even take this phone in it's current state? Am I just SOL?

I've run out of ideas and patience. I'm really hoping someone out there can help me. At the very least, thanks for reading my long sob story. Hopefully this never happens to you.