Failed to mount /Cache Nexus 7 (2013) Help!

Hi Everyone,

I am stuck, I have exhausted all options I know and searched thru the internet and nothing that has helped me, so I am posting my problem here.

I have Nexus 7 (2013) LTE version, Its completely stock, locked bootloader and stock rom. My parents use it.
On try to start the tablet it stays stuck with Google written on the screen, I went into the recovery, The cache partition is not mounting

this is the message on the screen

E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/log
E:Can't open /cache/recovery/log
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/ last_log
E:Can't open /cache/recovery/last_log
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/ last_install
E:Can't open /cache/recovery/last_install
E:failed to mount /cache (Invalid argument)
E:Can't mount /cache/recovery/ last_kmsg
E:Can't open /cache/recovery/last_kmsg
E:Failed closing /dev/block/platform/msm_sdcc.1/by-name/misc (I/O error)
E:failed to mount /cache (Invalid argument)

It no longer has warranty

I tried to unlock the bootloader so I could flash the rom, but the moment it just shows the message when you first unlock the bootloader...
on the computer it shows erasing userdata and stays stuck there for a long time and it times out. I cant flash a new rom as the bootloader is locked.
I tried to sideload thats not working.
I have a feeling EMMC is gone.

Can I buy the main board and fix this? Or anything else that I can do?

Thanks in Advance

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