Nexus 5 (D820) 32GB - Dead eMMC?

Hello XDA Forums,

As a long-time lurker, I usually don't have the desire to actually post anything on the forums, but here it goes.

Little backstory: I've given my 'old' Nexus 5 to my girlfriend as a hand-me-down device. She loved it. Unfortunately, a week ago it started to do this weird "boot-loop" thing, so she's had to resort to using the backup Nexus 4 for now.

Below are the Nexus 5 specifications:

PRODUCT_NAME: hammerhead
VARIANT - hammerhead D820(E) 32GB
HW VERSION - rev_11
BOOTLOADER VERSION - HHZ20g
BASEBAND VERSION - M8974A-2.0.50.2.29
CARRIER INFO - None
SERIAL NUMBER - XXXX
SIGNING - production
SECURE BOOT - enabled
LOCK STATE - locked

The phone is fully stock.

So, just to reiterate, the phone currently fails to boot past the 6.0.1 Boot Animation Screen: https://www.youtube.com/watch?v=BRwERwyKvc0 -- it just sits there, loading forever.

First thing I did was boot into Stock Recovery, and I'm instantly presented with the following error:

Code:

---

E:failed to mount /cache (Invalid argument)

---

http://imgur.com/1cjI9hs

Then I tried to run the "Wipe data/factory reset" option and was presented with the following long line of errors:

Code:

---

E:failed to mount /cache (Invalid argument)
...
E:Can't mount /cache/recovery/log
E:Can't open /cache/recovery/last_log
...
etc etc..

---

http://imgur.com/njuKBO8

I've tried to manually flash the latest Booterloader/Radio/Img in Fastboot, but I get the following errors there:

Code:

---

FAILED (remote: flash write failure)

---

http://imgur.com/FrCyb04

------------------------------------------------------------------------------------

Thing is, I can do a "fastboot boot recovery xxx.img" and it'll boot into whatever custom/stock recovery I like, but even those custom recoveries still give the mounting errors..

Hell, I've even tried using the Wugfresh Nexus Root Toolkit, but it produces the same results.

So, at this point, I'm not really sure what I can do. Anyone have any other suggestions? Is the eMMC dead?

Thanks,
Jowdy