Stuck at "Android is Starting..." after entering TWRP - OnePlus 5T Questions & Answers

I just got the phone, so I have nothing installed and nothing to loss at this time, luckily.
I have unlocked and installed Codeworkx TWRP and Magisk for root.
The phone was fine, I configured some settings then rebooted to TWRP and made a backup, before installing anything.
This is when I encountered the issue:
Upon rebooting the phone is stuck at "Android is Starting..."
Now I can unlock (pin or fingerprint) and access settings, but only settings as I have no launcher.
I tried rebooting and wiping the cache and Dalvik without any change
Since I'd restarted more than once without issues I can only assume the cause was performing a backup via TWRP.
Now as stated I have nothing installed I can wipe anything and begin again, but if this happened in a normal situation, I'd be in real trouble. Any Ideas why this happened?, as it seems very odd that I can access the phone and setting, but can not get a launcher to start.
More over any suggestions on how to fix it short of reinstalling?
I'm very worried as this would make the phone unusable if it happened in a normal situation.
ERIC

Your installation or use of TWRP probably has nothing to do with it.

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Weirdest problem with the 816

So I am keen on how to fix bootloops and going back to stock/rooting, etc...
My friend asked me if I could fix his phone for him, so I said why not. Thing is, it's the weirdest problem I ever faced with a phone, EVER.
The problem is the phone boots normally, I unlock the pattern, some seconds later it turns off and reboots. So I said hey why not boot into safe mode, perhaps it's an app causing all of this, so I did, worked perfectly, turns out "Google Play Services" was "forcing close" and suddenly phone turns off. I uninstalled all updates, cleared data, cache, everything and installed EVERY SINGLE APP on the phone and removed pattern, then rebooted phone. BUT, when i rebooted, the pattern was back, language was back to arabic (I changed it to english when in safe mode), ALL APPS were back, and the updates to Google Play Services were back. It's like I didn't do anything. So I said before it turns off I'm goin to try 1 thing, so I immediately went into settings and managed to uninstall updates for Google Play Services and cleared cache data, even to all google apps, and then I re-uninstalled all applications (out of safe mode), I thought perhaps when irebooted from safe mode, everything was back, now that I'm goin to reboot out of safe mode, this will work. So I rebooted, and guess what? EVERY SINGLE APP was back, system language back to arabic, AGAIN, and pattern was back and GPServices updates were back.
So I said hey, let's factory reset. SO I went into safe mode, I hit factory reset, phone reboots to recovery (vol up + power ) > Factory reset done > wipe cache partition done > reboot : EVERYTHING WAS THE SAME. I am completely shocked. I tried doing Factory reset out of safe mode too, same result. So I said hey, let's unlock this thing and just flash a stock rom, that'll fix it indeed. I went into fastboot and tried flashing the unlock token, the confirmation page appeared, clicked "YES", phone reboots: PATTERN AND EVERYTHING STILL THERE, while they shouldn't be since unlock performs a Factory reset, so I went back to fastboot and it indeed was NOT unlocked, I tried many times and it failed every single time I tried.
So I said hey, download AVG Antiviirus and run it perhaps it can find the problem, so I did and ran it, couldn't find anything, rebooted phone and AVG was gone. So I said, hey, again, download Google Play Services and install it on your phone, perhaps it will permanently override the one existing and it will fix the problem (it didn't, it would disappear and the old G.P.S reappear as soon as I reboot). So I said hey, you got the OTA Zip, it has the firmware, perhaps flashing that firmware will shake things up, most probably brick the phone but perhaps will let me unlock it. So I went into fastboot > fastboot oem RebootRUU > phone reboots normally, I CAN'T even access RebootRUU.
So as you can see I probably tried everything one can do in this situation.

[Q] Weird bootloop

NOTE: This device is not mine, it belongs to my girlfriend and I am the one troubleshooting for her.
here goes:
Yesterday, while a friend of my girlfriend's was playing with her Galaxy Nexus (my GF's), it suddenly rebooted itself without warning.
From what I understand, Nexus bootloops that are caused by faulty flashing usually loops at the "Google" logo (correct me if I'm wrong). Her's is a different story, her Galaxy Nexus is pure stock, locked bootloader, un-rooted and definitely nothing custom on in; literally pure stock. Instead of looping at the "Google" logo, her GNexus loops at the "X" logo, my assumption is that there is something, maybe a rogue app, that is causing her device to bootloop upon reaching startup phase.
I know this isn't a software/ROM level issue since we were able to get to her lockscreen a few times and then the phone reboots after a few seconds. I've tried wiping cache but didn't work, and she won't let me try wipe data/factory reset because she has a lot of important files on her phone. So odin flashing and wipe data/factory reset is out of the question.
so here are some details that might be of interest:
1.) Her phone is not rooted and is pure stock android 4.1.2
2.) does not have custom recovery
3.) does not have usb debugging enabled (not sure, but I assume it's not enabled)
4.) can still boot to fastboot/recovery/download mode
5.) reboots at the X logo
So the basic troubleshooting methods are out, now I'm thinking of using adb pull to extract files from her phone via adb, but problem is, usb debugging is off! Is there any way of recovering her files at least without booting to the ROM itself so I can flash another version of android on it (via odin)?
I've also read about "safe mode" that boots the device without starting up 3rd party apps, only the core essentials. I'd like to go down that route if possible, but we've tried most of the guides on how to boot into safe mode but to no avail. There was one time though that the device booted up and she managed to: open power menu > hold power off > reboot to safe mode, but nothing happened, it just rebooted only to get stuck at the X again.
I may be overthinking this, so I've turned to XDA for help. I know you guys don't like people asking n00bish queries but I've exhausted everything I can think of and I'd like to try everything before I go down the route where I can possibly do even more damage.
I really need help with this, anyone have any ideas? We'd really appreciate it!
Unlock, flash custom recovery, wipe system, data, cache, dalvik cache and flash 4.3 factory image. Problem solved.

[Q] Phone randomly crashes, trying to root now.

I had the phone for about a month now, i bought it on ebay it stated it was New, i check and it is still locked S-On.
But just randomly it started to crash and reboot. I tried all the basic steps, remove apps but every time it reboots it reloads everything back on it.
I tried both hard reset and factory reset both did not work. I'm noticing that i cant turn off fast boot because once it crashes and reboots, all the setting and apps go back to the way it was. Now I'm trying to root it to see if that would cure the problem and thinking possibly an update got corrupted or something and i know once you root it, it will erase all internal data.
While trying to root it, i got all the way to loading the bootloader and once i selected yes to unlock bootloader, it restarted but nothing happened it went back to the way it was. I've tried to delete/erase my data and cache through windows command but keeps saying it failed. Also now i cant start the bootloader over again.
Any ideas what i can try or do? is there an Hboot loader since I'm not able to turn off the fast boot in the setting?
I'm very new to rooting but catching on quickly.

"com.android.systemui has stopped" bootloop -- Help fixing?

I have a LG G3 with rooted stock rom running xposed.
So I pulled my phone out of my pocket today only to see the Verizon boot logo in effect. I was thinking "that's weird, guess my phone needed to reboot? Strange." But the only problem is it never stopped. It will only boot up to the lock screen and occasionally it will display an error message telling me the systemui has stopped. Then about 10 seconds later, it reboots itself. It continues this process until I pull the battery.
I've tried booting into safe mode, no luck. It doesn't even actually boot into safe mode (it doesn't say safe mode in the bottom left corner.)
I tried wiping the cache, no luck.
I don't want to just do a factory reset because that hasn't seemed to help anyone else with this issue as far as I've seen. I have not found any helpful information on how to fix this problem.
My question is, what do I do? I feel lost on this subject. Normally I've always been able to diagnose problems on my own, but not in this situation.
I have all my apps and data backed up to Titanium Backup on my SD card.
Any suggestions?
Xposed is more than likely the cause. Boot into TWRP and open a terminal, then type the commands as shown in the OP of this thread to bypass it...
How to Disable Xposed on Lollipop when stuck in Bootloop
http://forum.xda-developers.com/xposed/xposed-lollipop-stuck-bootloop-t3055816

Wrong pin bug resulted to bootloop after factory reset

Hey guys,
The tablet wouldn't recognise my pin. It happened once before but a simple reboot fixed it. This time nothing I tried worked (switched accounts, restart, wiping cache partition). So after a lot of consideration I decided to go to Recovery and do a factory reset. After it finished, it automatically restarted and since then it's in a bootloop.
All the instructions I've read about factory reset say you need to manually reboot after it's finished whereas mine rebooted by itself. Do you think that's why it's stuck now? What can I do?

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