Galxy S3 doesn´t get past first screen / failed to mount - XDA Assist

Hey guys, got my 2 year Samsung Galaxy S3 GT-i9300 that suddenly turned off and won´t start. It gets stuck on the page that says in white letters GALAXY SIII...etc before the logo with the samsung blue thing circling appears.
So, tried to go into safe mode. No luck.
Recovery mode:
green android dead on it´s side, red sign and...
e: failed to mount /efs (no such file or directory)
e: failed to mount / system (nsfod)
#Manual Mode#
Applying Multi-CSC
same failed to mount but with system, then cache and then cache/recovery
Did a wipe cache partition and this appears:
e:/format_volume: make_extf4fs failed on /dev/block/mmcblk0p8
Cache wipe complete.
e: failed to mount /cache (block device required)
e: can´t mount /cache/recovery/log
e: can´t open /cache/recovery/log
and lots of similar lines.
Now...I´m not an expert, don´t have my phone rooted. After reading hundreds of threads last night, I opted to try the ERASE DATA / FACTORY RESET, and nothing happened.
Downloaded KIES, it will stay in the page saying ¨Connecting¨ so it doesn´t recognize the phone, but I still went into the 2nd option of tools to reload a firmware. It asks for Model and S/N, goes into download...take 5/10 minutes to download it....but then stays in 0% when installing it. It stays like this for hours.
Tried unplugging, and changing USB slots...but still doesn´t go past 0%.
My phone has been having trouble lately with the power button...sometimes when I take the battery out and put it back in it starts on it´s own.
I really don´t mind loosing my data...but if I could retrieve it somehow before deleting everything it would be the topping on the cake!
Thanks for anyone who can assist me on this.
Nico
(Oh...errors that happened 5 minutes before it went dead: something like Messenger stopped working, 3 times....I was doing something else so I decided to uninstall FB Messenger. A couple minutes later the phone died and I couldn´t get past the splash screen (heard you call it like that to the first screen that appears in white letters?).

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Hello,
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Hello,
Today I woke up to my phone boot-looping after leaving it to charge overnight, despite it having run fine for close to a month (I have been running Cayanogen Mod ROM and TWRP 2.6.4.3 since I got my Nexus 5).
After a long wait at the Google and Nexus logos, there's a system popup of 'Cayanogen logo" present on the screen. However, right after completing the 'updating of apps', the system popup 'Media Storage has stopped working' appears and the phone immediately restarts again.
Upon booting into TWRP, it presents me with a password screen, which I have never encountered before. After pressing 'Cancel' though, I'm directed to the TWRP main menu.
Attempts to factory reset the phone resulted in:
Formatting cache using make_ext4fs function.
E: Unable to mount '/cache'
Updating partition details...
E: Unable to mount '/cache'
E: Unable to mount '/persist'
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Hi all,
First of all, my phone is completely vanilla, no rooting or modifications were done. Running 5.0
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So I'm kinda new to this so forgive me if I cannot provide adequate information.
Background/Necessary info
Just recently, my phone died and wouldn't turn back on. I fixed this by keeping my phone on the charger forever and holding the power button forever. When the phone finally powered back on, every app began to crash, including process com.google.process.gapps. It was so bad to the point where I couldn't use the phone normally. I tried to fix it by booting into recovery and restoring the phone to the factory version. This brings me to:
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A lot of research on google led me to some:
Attempted fixes
I tried unmounting and mounting system/data/cache/external sd, formatting the cache/system, to reinstall my existing mod from my sd card (that gave me error 7), and I tried wiping the cache partition. Nothing worked.
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phone stuck in bootloop

good evening, i have a problem with my phone. i have an exynos7870 j7 2016 with a modded galaxy s20 ultra oneui 2 android 10 rom with root (magisk). it's kinda buggy sometimes but i've had it for a year and a half.
not too often, my OS would randomly go from being powered on to showing the samsung loading splash screen, like it was turning on. i would always hard reset the phone as it would be stuck in this screen and it would reboot normally. this time, however, was different.
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Markdown (GitHub flavored):
Could not mount /data and unable to find crypto footer.
Failed to mount '/data' (Invalid argument)
Unable to recreate /data/media folder.
Updating partition details...
Failed to mount '/data' (Invalid argument)
...done
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Unable to mount /data/media/TWRP/.twrps
MTP enabled
Failed to mount '/data'(Invalid argument)
an additional thing to note is that teamwin restarts itself the moment i press the restart button where it otherwise asks for confirmation. i found that strange but i'm not sure if it's related with my problem.
any help regarding this problem would be much appreciated. i want to try to not have to wipe my phone and reinstall the OS because i have some sensitive applications (like lastpass authenticator) that i don't want to lose access to, but if i really have to, then i'd like to know if 1. there's a lineageos build for my phone and 2. if it would run better / be better for my device.
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