So I need serious help guys and I don't know who to turn to.

So... I had nice and *Working* rooted android 6 in Galaxy S7 (SM-G930F)
till few days ago, I didn't really wanted to update the OS but sure wanted to replace my root to Magisk so I backup my apps and settings in the poor Smart Switch and went with this guide
https://android.gadgethacks.com/how-to/magisk-101-switch-from-supersu-magisk-pass-safetynet-0177578/

Took me a while to install TWRP since I haven't done if for years and I'm pretty much noob when it come to rooting feature honestly (I'm only rooting to use some specific things and have more apps I could install if I'll need to)

So after everything was ready I went ahead and unroot the phone from SuperUS but "surprise surprise" the phone OS broke and the phone stuck on the logo screen, so I had to reinstall the entire OS to updated android (since I forgot to use the TWRP and didn't really cared as long as my apps and settings are already backup on my pc), from there things just get worse, I need to reinstall the entire OS and was able to find android 7 version that I could flash using Odin
(I needed the OS with my local language and used these specific files:
BL_G930FXXU1DQB7_CL10422490_QB12445332_REV00_user_low_ship.tar
AP_G930FXXU1DQB7_CL10422490_QB12445332_REV00_user_low_ship_meta.tar
CP_G930FXXU1DQB1_CL10422490_QB12282417_REV00_user_low_ship.tar
CSC_OJK_G930FOJK1DQB7_CL10552480_QB12447301_REV00_user_low_ship.tar)


And from there (after I flashed the OS) I auto update to android 8 and went to root again,

issues was that 99.9.9.9999999% of the guides already assumed for some reason you're:
1. have SD card (luckily I have one I had to take from my older phone but just want to point out how it annoy)
2. Already have root phone when you want to install Magisk
3. Know how to use most of the root features (even these that have nothing to do with most guides)
4. Know how to extract your android image and create boot image
5. Never in your sweet life was technologically challenged (that right! you need to know 100% of everything the moment you turn 5 at this day and age apparently :D)

So most of them were unhelpful for someone who wanted to root to Magisk from ****ZERO**** on andorid 8.

So I tried to install TWRP again with odin (which worked just fine, But also I told it to install the TWRP app mistakenly in the recovery screen... hope it didn't ruin anything...), then tried to root my phone again using Magisk manger to get the most up to date ver again, in TWRP however the installation of Magisk v16 failed, I even tried to use the VerifiedBootSigner-v7 with the "use with other zips" option and got the got the same result,

So trying to root it again with SuperUS in order to try and switch to magisk again (this time with fresh new OS) I tried to re-root again using this CF:
CF-Auto-Root-herolte-heroltexx-smg930f.tar
(Seem to be the old one I used to root my phone two years ago but I took the link from updated guide), and my phone's OS just broke and rest to factory settings.

And the nice part is that after the factory rest, while the root checkers apps don't detect my phone as rooted, the OS sure is and tell me I can't update the phone anymore since I messed with some stuff...
Not sure what to do, I tried to flash android 7 again using the same files I wrote above in order to "format and reinstall everything" but as you may suspect it didn't work and Odin sent a warning, so now I'm stuck on Android 8 unroot, sweet....

I still had TWRP so I tried to install magisk again but using different ver and failed

Looking on the net for answers I eventually bump into this guide
https://www.youtube.com/watch?v=JwLja68KmKM
Which finally assumed you root to magisk from unroot phone and gave updated version of magisk (Magisk-v16.4) and verity opt rar (no-verity-opt-encrypt-6.0)

And I still didn't was able to install magisk

[IMG]blob:https://imgur.com/da06fcc1-2188-4474-a893-426223c856cc[/IMG]

(Red error above is the same error, cause I tried to install the same version twice so igonre it).

The only two things that were different in the video and my end were:
One: I had the TWRP app installed (which he kept telling to not do it) beforehand, and
Two: was that he didn't got any error in the installation of magisk while I did.
Thanks to this video I format the phone quite a lot so don't expect any log (which I have on clue where I can get it to begin with).
I also tried the uninstaller in the recovery in case it thought something was already installed beforehand, it failed too and gave some errors.

I eventually tried to find a guide that show you how to add Magisk without any recovery tool, but all of them assumed I was already rooted (I'm looking at you adb guides) or that I know how to extract the boot image (which I wanted so I could use Odin with image tar to flash magisk on my phone)
And non explained things in a good way that nood can understand either, I was honestly surprised how most of the guides were lacking in many different fields.

And that's were I stand now, I want to completely re-flash my phone's OS to the last ver (but in my local lang) so I could remove any "root" leftovers in the OS and start all over again, but I can't cause I dk where I can find the right files for Odin in order to flash it.

I want to root my phone to Magisk or at this point to Any kind of root (honestly I prefer magisk if possible) but now I can't thanks to the new OS.

I want to eventually load my backup and use my phone, but there's no point to do it yet if I may going to wipe it soon anyway.

So can anyone help me get magisk to work and if possible updated version of Android 8 for odin?

Thanks