Unable to mount storage in TWRP, unable to open '' to wipe crypto key

Hello everybody,
I'm facing an issue with my phone. I was running Fulmics Rom 6.1 on my LG G3 for a few days, when, this morning, I woke up to find my device caught in a bootloop. I had a recent TWRP backup, so I tried to restore it, but it failed with the error : "Unable to wipe System".

I tried to wipe everything but my SD Card and got :

Code:

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Failed to mount '/data' (Invalid argument)
Failed to wipe dalvik
Updating partition details...
Failed to mount '/system' (Invalid argument)
Failed to mount '/data' (Invalid argument)
Failed to mount '/cache' (Invalid argument)

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I tried to use "Format Data" in TWRP Wipe Section, but got :

Code:

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Unable to open '' to wipe crypto key
Unable to wipe Data.
Unable to format to remove encryption.
Updating partition details...
Failed to mount '/system' (Invalid argument)
Failed to mount '/data' (Invalid argument)
Failed to mount '/cache' (Invalid argument)

---

When I try to mount the partition, Internal Storage is shown to have a size of 0MB.

Flashing the Rom again fails as well as it stays stuck at this step :

Code:

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Install new system
Extract:/tmp/unpackbootimg

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I'm using TWRP 3.0.0-0 and tried to update it, but when I want to flash the .img, the section "Select Partition to Flash Image" is empty.

Any idea about what I could do next ?


Thanks a lot.

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