Cannot convert to system app (boot loops) - 6T - OS 10.3 - OnePlus 6T Questions & Answers

Hello all,
I just updated my 6T (international version) to OS 10.3 with TWRP 3.3.1-30 and Magisk 20.1, and no problems there. I did a full wipe, so we should be back to square one. Now, I'm attempting to convert a GPS joystick app to a system app and I'm running into issues where it will not let me do it regardless of how I try.
1st Attempt: I downloaded Link2SD and attempted to convert my app to a system app. At first I was told I had no space on the root directory (picture attached). Not sure why this is since the phone is completely wiped with nothing but factory apps installed, but I deleted a couple of unneeded apps to free up the space I did need. After this, I still got an error message that said mount: '/system' not in /proc/mounts (picture attached). I found a couple mentions of this error on here that mentioned remounting the root directory to make it writable, but nothing on clearly how to do that.
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2nd Attempt: I rebooted my phone into TWRP, mounted the system directory, and attempted to use the TWRP file manager to manually move the app to /system/priv-app. I was able to do this in TWRP, but when I rebooted the phone it just hung on the boot screen (the one with the spinning red dots) and never made it past that screen. It didn't freeze on this screen (the dots kept moving), it just never made it past it. When i went back into TWRP and deleted the file I had moved, it would reboot like normal.
So, any advice on where to go from here? It's getting frustrating.
Thanks in advance.

Magisk module 'App Systemizer'

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Similare problem here
I have a similar problem, but a little different...
Rooted the phone and then tried to flash TWRP using their official app., It stated that everything was successful and asked if I wanted to reboot into recovery. I tapped yes so I could make my first backup., Now the phone starts and shows the logo in your image then goes to a blank screen and thats it... Cant boot into recovery or bootloader or anything...
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File and folder names suddenly all randomized

Hi,
I had a OP5 with stock 4.5.14, TWRP, SuperSU and wanted to update to 5.0.1 with TWRP 3.2.1-0 for Oreo by codeworkx and Magisk 15.2
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I formatted data in TWRP which fixed it. Not sure what caused it, if flashing the supersu uninstaller ****ed up the file system or corrupted the permissions, or something else entirely. Fortunately I did a backup of all my important files.
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Then, to resolve it, I manually downloaded Version WW-15.2016.1902.340 zip file from Asus to my external sd card.
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The message shown is as below in the 2nd attachment.
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If i insert an usb cable and connect to a computer, internal memory/sd card of the phone is not accessible. It does not show at all in the computer.
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Specify every details of your phone. Build, root or non root etc. Also mention the tweaks that you've fine if any. Do this for better chances of getting proper fix.
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*On my last try some blue lines appeared.
*Update:
I tried to flash the system image from the fastboot, i got a glimpse of the "FIRE" logo, under it was " erasing", maybe that will work? I'm trying now to use "fastboot update 6300.zip" but it says :
archive does not contain 'android-info.txt'
fastboot: error: could not read android-info.txt
Click to expand...
Click to collapse
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Omg guys new day, new beginnings and i found a fix for my problem.
Go into recovery tap advanced > tap fix contexts > reboot.
Jeez such an easy fix and I was searching for hours yesterday.
Lol, didn't PCs teach you anything?
As stable as Androids are it's easy to forget to reboot... but Gookill apks are the worst.
Welcome to XDA Enjoy

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