TWRP cannot mount /data; nothing 'sticking' using fastboot

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Jun 8, 2012
Hi all,

hoping on the off-chance someone's still monitoring the Nexus 5 forums here :)

So decided to dust off the old Nexus 5 (now with extra COVID-19 time on my hands!) to use as a backup device, but having serious issues getting it up and running. I had it rooted years ago, and had no issues installing custom roms.

Now I'm having the following situation:

I cannot flash the factory image using fastboot, nor anything is 'sticking' to the phone when I try to re-flash individual component for the factory image. I've also tried to flash TWRP, but again, it doesn't stick and the only way i can boot into TWRP is by using
fastboot boot recovery.img

However in recovery, the data partition is not mounting and all the tutorials/guides I read about fixing it aren't working (e.g. repairing the partition-- get a 'unable to repair data' error; changing from EX4 to EX2 and back-- get 'failed to mount '/data' error).

Ran the following command in the terminal window in TWRP
cat /etc/fstab
and got the following output:

/dev/block/mmcblk0p25 /system ext4 rw 0 0
/dev/block/dm-0 /data ext4 rw 0 0
/dev/block/mmcblk0p27 /cache ext4 rw 0 0
/dev/block/mmcblk016 /persist ext 4 rw 0 0
/dev/block/mmcblk0p1 /firmware vfat rw 0 0
 /usb-otg vfat rw 0 0

tried using the make_ext4fs command, but again- nothing happens.

Using TWRP 3.3.1-0 by the way

Any ideas? is the phone completely bricked? it's stuck in a bootloop where the google colours come up but freeze within half a second, repeat and continue.

Any advice would be very much appreciated!
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