Possible brick.. need assistance from a guru! - Transformer TF300T Q&A, Help & Troubleshooting

Ok so I have a asus transformer tf300t and I have been using Kat Kiss Roms for quite awhile.
I am using TWRP v2.8.1.0 and I have never had ANY issues. I was running KatKiss Lollipop 5.1.1 v29
well I was working with an app I downloaded to create a short video, anyways it crashed the tablet and started to boot but sat at the KatKiss logo for a very long time. I booted into TWRP and noticed it showed 0gb space on my internal storage. I was not able to mount or run a restore.
Here is what TWRP was showing
E: could not mount /data and unable to find crypto footer.
E: unable to mount '/data'
E: unable to recreate /data/media/folder.
Updating Partition details...
E: unable to mount '/cache'
E: unable to mount '/data'
E: unable to mount storage
E: unable to mount /data/media/during GUI startup
E: unable to mount '/cache'
Kernel does not have support for reading SELinux contexts.
E: unable to mount '/cache'
E: unable to mount '/cache'
E: unable to mount /data/media/TWRP/.twrps when trying to read settings file
E: unable to mount '/data'
MTP Enabled
E: unable to mount '/cache'
E: unable to mount '/cache'
E: unable to mount '/data'
E: unable to mount '/cache'
E: unable to mount '/data'
Is there anyway to fix this? I was searching but I wasn't sure which one to follow... and I have never attempted to recover a "bricked" tablet since it has never happened.
Any help would be GREATLY appreciated!!!!

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E: Unable to mount '/cache'
E: Unable to mount '/cache'
E: Unable to mount /data/meida/TWRP/ . twrps when trying to read settings file.
E: No valid storage partitions found for MTP.
E: Unable to mount '/data'
E: Unable to mount '/data'
That's what i got into recovery, i can't flash anything with fastboot cuz it says "FAILED (remote: failed to erase partition)".
Can someone help me?

Samsung galaxy gt-s7275r e:can't open /cache/recovery/last_log

Just this morning as i put on my phone ,it went on upgrading but couldn't finished and cant resurrect any longer it seems like a joke as i did every thing but no avail i quite for that day...Have to use my SD card to wake it and now this what i "ve got.... Although is not a rooted device, flashed firmware KIES also with CWM/TWRP but this report still exist please someone give me a hand.
E: Failed to mount /cache (Invalid argument)
Can't mount '/cache '(Invalid argument)
E: Can't mount /cache/recovery/Last_recovery
E: Failed to mount /data (Invalid argument)
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Stuck in TWRP

Hello people!
So, i will tell all the story, i tried to flash a ROM in my Xperia Z3 (D6643), following this tutorial, the TWRP worked fine, even after installation the message was "Installation successful" then i rebooted. But nothing, just nothing, even TWRP :crying:
He vibrates when i tri to power on in any boot method, i can also connect in PC in fastboot mode.
I had rooted and unlocked bootloader, any solutions?
Edit: I flashed TWRP again and now i can enter in recovery mode, then i tried factory reset, theres the log:
Could not mount /data and unable to find cryptofolder
Failed to mount /data (invalid argument)
Unable to recreate /data/media folder.
Updating partition details...
Failed to mount /cache (invalid argument)
Failed to mount /data (invalid argument)
...done
Unable to mount storage
Failed to mount /data (invalid argument)
Failed to mount /cache (invalid argument)
Full SELinux support is present.
Failed to mount /cache (invalid argument)
Failed to mount /cache (invalid argument)
Failed to mount /data/media/TWRP/.twrps
Failed to mount /data (invalid argument)
MTP Enabled
Failed to mount /data (invalid argument)
Formating Cache using make_ext4fs...
Failed to mount /data (invalid argument)
Updating partition details...
Failed to mount /data (invalid argument)
...done
Unable to mout storage
Edit: I noticied the internal storage is listed with 0MB. Please help...
Edit: Ok i got it, i will let the solution if someone is having the same issue
CM 14.1 dont work on Xperia Z3 D6643, that was the problem, the solution was find a compatible ROM. In this case i used this one.
Pretty simple

Unable to mount storage & '/data' on Micromax A311 in TWRP 2.8.6.0

Hello,
I tried installing a custom rom on my Micromax A311 via TWRP but during the process the phone switched off.
When I turned it on it was stuck on brand logo. Again I tured it off & went into Recovery mode.
Here I can not wipe anything, it says:
Updating partition details . . .
E: Unable to mount '/data'
. . . done
E: Unable to mount storage
E: Unable to mount /data/media during GUI startup
Full SELinux support is present
E: Unable to mount /data/media/twrp/.twrps when trying to read setting files
E: Unable to mount '/data'
MTP Enabled
E: Unable to mount '/data'
E: Unknown MTP message type : 1
E: Unable to format to remove encryption
Updating partition details . . .
E: Unable to mount '/data'
. . . done
E: Unable to mount storage.
What should I do now ?
Please help.

Motorola Xoom /data & /cache (invalid arguments) error

Hi to everyone,
I would like to ask for your help, i want to restore a motorola xoom tablet for my nephew. But trying to restarod i found an error with the TWRP Recovery 3.0.2 at the moment to wipe the /data & /cache partitions pops this errors.
Failed to mount "/data (invalid argument)
unable to recreate /data/media folder.
Updating partition details...
Failed to mount "/data (invalid argument)
Failed to mount "/cache (invalid argument)
...done
Unable to mount storage
Failed to mount "/data (invalid argument)
Failed to mount "/cache (invalid argument)
kernel does not have support for reading SELinux contexts.
Failed to mount "/data (invalid argument)
Failed to mount "/cache (invalid argument)
Unable to mount /data/media/TWRP/ . twrp
MTP Enable
Failed to mount "/data (invalid argument)
Failed to wipe dalvik
updating partition details...
Failed to mount "/data (invalid argument)
Failed to mount "/cache (invalid argument)
...done
unable to mount storage
I already try to install the rom.zip but i got stuck in the bootscreen logo. Looking in different blogs and forum i try the "Change file system" method to convert from ext4 to fat and go back to ext4 but it gave me the same error.
Thank you for the time to read me and to the incoming answers that i can get from all of you.

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