Moto G 2014 without OS or any connection, stuck with fastboot and TWRP For a few days now, I've been trying to recover my phone. It's a XT1069 (a brazilian dual-SIM Moto G 2014 with 16 GB of storage and DTV). It had a Resurrection Remix ROM with Android 7.1. The battery died, and then whenever I tried to turn it on, it got stuck in Resurrection Remix's loading screen, for whatever reason. That wasn't really a big issue, in fact it was actually good, because it gave me motive to update my ROM, which I was planning to do.

Up until then, everything was working fine (although Resurrection Remix didn't boot). I downloaded Pixel Experience with Android 8.0, then I opened TWRP and transferred it to the phone through USB (TWRP supports it). I wiped the system partition (don't remember why - maybe I had tried to install it before and got an error, maybe out of space, I don't know) and tried to flash it. It gave an error, which basically meant I had to update TWRP.

But uh oh! I can't anymore. My PC won't detect the phone whatsoever! I tried using fastboot, ADB in TWRP, MTP in TWRP, but all I can do via USB is charge it (TWRP does display a "+" after the battery percentage, and it does charge). I was using Debian 9.0.0 when I did this, but I accidentally deleted all partitions in my HDD while trying to install Windows 10, managed to recover them, and finally actually installed Windows 10 (for dual boot - I couldn't dislike Windows more). In either Debian or Windows, it doesn't detect it anymore. Previously it would make a sound and display a notification. It doesn't anymore, in the same conditions (in TWRP, with MTP either enabled or disabled). ADB and Fastboot don't work at all, where they previously did. I already installed drivers in both OSes. Actually, before I even installed drivers, it worked. Even the SD card isn't being detected by the phone anymore. It doesn't mount in TWRP (no error, it seems it wasn't even inserted), and I can't access it in the Install menu (says it's 0 MB, and won't access it). It previously worked.

I've searched around a ton. Every solution is basically installing drivers, using MTP (can't do), disabling MTP to use ADB (can't do), using ADB Sideload from the Advanced menu in TWRP (can't do), restarting computer and/or phone, updating TWRP (can't do), SD card (can't do), USB OTG (I don't have an adapter, and buying one would require my parents' consent, which is a bad thing, and besides, considering the other options, it's not likely that it'll work).

I'm desperated. I don't know what to do anymore. Can somebody help me? What can I do to update TWRP, while my phone is in this state?

(Large question, eh. Well, I'm being as specific as I can. Please read it so you can understand the situation.)
I have had this exact problem with an XT1039. As you've deleted the system partition you'll need to restore to a factory ROM for the phone, which is on XDA.
Boot to recovery (power + volume down), and plug the phone in to your PC and you should have access to a minimal adb. Flash the factory image and it should then boot.

These instructions should help: https://forum.xda-developers.com/showthread.php?t=2542219