This is the normal LineageOS loading screen, which I had until yesterday:
[![enter image description here][1]][1]
**Problem**: Since yesterday, only one circle is going from right to left, forever. In other words, it never reaches the 3 circles (even after 8 hours overnight), and my Nexus 5 has become useless.
After reading https://android.stackexchange.com/questions/88662 I tried pressing Power/Volume- at the same time for 30 seconds. Result: It makes the fastboot screen appear for less than a second (during that split second I can move the cursor with Volume+/-), then the screen turns black, then fastboot for a split second again, then this boot-loop:
1. white Google+unlocked lock on black background, for a few second
2. black screen
3. Vibration
4. Back to step 1
Pressing the same Volume-/Power during the earlier "white Google+unlocked lock on black background" screen results also results in the same boot-loop.
During all of these phases (animation, fastboot, boot-loop), running `adb logcat` from my connected computer only shows `waiting for device`.
I am performing all of this with the charger plugged in. I even changed the battery to make sure it was not a power problem. To check I managed to quickly push "Power off" in fastboot and it shows the battery level: 100%.
The computer/port/cable I am using are the ones that I have been using everyday for years to transfer files and debug apps over USB. I also tried a wall charger and new cable too to make sure, same result.
After plugging the phone into a Windows conmputer (instead of my usual Linux), fastboot miraculously stayed on, and I was able to get the following information:
### Partitions
~ # cat /proc/partitions
major minor #blocks name
179 0 30535680 mmcblk0
179 1 65536 mmcblk0p1
179 2 1024 mmcblk0p2
179 3 512 mmcblk0p3
179 4 512 mmcblk0p4
179 5 512 mmcblk0p5
179 6 512 mmcblk0p6
179 7 2048 mmcblk0p7
179 8 1024 mmcblk0p8
179 9 512 mmcblk0p9
179 10 512 mmcblk0p10
179 11 512 mmcblk0p11
179 12 3072 mmcblk0p12
179 13 3072 mmcblk0p13
179 14 512 mmcblk0p14
179 15 16384 mmcblk0p15
179 16 16384 mmcblk0p16
179 17 3072 mmcblk0p17
179 18 22528 mmcblk0p18
179 19 22528 mmcblk0p19
179 20 22528 mmcblk0p20
179 21 3072 mmcblk0p21
179 22 512 mmcblk0p22
179 23 512 mmcblk0p23
179 24 512 mmcblk0p24
179 25 1048576 mmcblk0p25
179 26 30720 mmcblk0p26
179 27 716800 mmcblk0p27
179 28 28551146 mmcblk0p28
179 29 5 mmcblk0p29
179 32 4096 mmcblk0rpmb
### Mount
~ # mount
rootfs on / type rootfs (rw,seclabel)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,relatime,mode=755)
devpts on /dev/pts type devpts (rw,seclabel,relatime,mode=600)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,seclabel,relatime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
tmpfs on /tmp type tmpfs (rw,seclabel,relatime)
/dev/block/mmcblk0p25 on /system type ext4 (ro,seclabel,relatime,data=ordered)
### Block names
~ # ls -l /dev/block/platform/msm_sdcc.1/by-name
lrwxrwxrwx 1 root root 21 Jan 1 01:00 DDR -> /dev/block/mmcblk0p24
lrwxrwxrwx 1 root root 20 Jan 1 01:00 aboot -> /dev/block/mmcblk0p6
lrwxrwxrwx 1 root root 21 Jan 1 01:00 abootb -> /dev/block/mmcblk0p11
lrwxrwxrwx 1 root root 21 Jan 1 01:00 boot -> /dev/block/mmcblk0p19
lrwxrwxrwx 1 root root 21 Jan 1 01:00 cache -> /dev/block/mmcblk0p27
lrwxrwxrwx 1 root root 21 Jan 1 01:00 crypto -> /dev/block/mmcblk0p26
lrwxrwxrwx 1 root root 21 Jan 1 01:00 fsc -> /dev/block/mmcblk0p22
lrwxrwxrwx 1 root root 21 Jan 1 01:00 fsg -> /dev/block/mmcblk0p21
lrwxrwxrwx 1 root root 21 Jan 1 01:00 grow -> /dev/block/mmcblk0p29
lrwxrwxrwx 1 root root 21 Jan 1 01:00 imgdata -> /dev/block/mmcblk0p17
lrwxrwxrwx 1 root root 21 Jan 1 01:00 laf -> /dev/block/mmcblk0p18
lrwxrwxrwx 1 root root 21 Jan 1 01:00 metadata -> /dev/block/mmcblk0p14
lrwxrwxrwx 1 root root 21 Jan 1 01:00 misc -> /dev/block/mmcblk0p15
lrwxrwxrwx 1 root root 20 Jan 1 01:00 modem -> /dev/block/mmcblk0p1
lrwxrwxrwx 1 root root 21 Jan 1 01:00 modemst1 -> /dev/block/mmcblk0p12
lrwxrwxrwx 1 root root 21 Jan 1 01:00 modemst2 -> /dev/block/mmcblk0p13
lrwxrwxrwx 1 root root 20 Jan 1 01:00 pad -> /dev/block/mmcblk0p7
lrwxrwxrwx 1 root root 21 Jan 1 01:00 persist -> /dev/block/mmcblk0p16
lrwxrwxrwx 1 root root 21 Jan 1 01:00 recovery -> /dev/block/mmcblk0p20
lrwxrwxrwx 1 root root 20 Jan 1 01:00 rpm -> /dev/block/mmcblk0p3
lrwxrwxrwx 1 root root 21 Jan 1 01:00 rpmb -> /dev/block/mmcblk0p10
lrwxrwxrwx 1 root root 20 Jan 1 01:00 sbl1 -> /dev/block/mmcblk0p2
lrwxrwxrwx 1 root root 20 Jan 1 01:00 sbl1b -> /dev/block/mmcblk0p8
lrwxrwxrwx 1 root root 20 Jan 1 01:00 sdi -> /dev/block/mmcblk0p5
lrwxrwxrwx 1 root root 21 Jan 1 01:00 ssd -> /dev/block/mmcblk0p23
lrwxrwxrwx 1 root root 21 Jan 1 01:00 system -> /dev/block/mmcblk0p25
lrwxrwxrwx 1 root root 20 Jan 1 01:00 tz -> /dev/block/mmcblk0p4
lrwxrwxrwx 1 root root 20 Jan 1 01:00 tzb -> /dev/block/mmcblk0p9
lrwxrwxrwx 1 root root 21 Jan 1 01:00 userdata -> /dev/block/mmcblk0p28
### Filesystem
~ # blkid /dev/block/mmcblk0p28
/dev/block/mmcblk0p28: UUID="57f8f4bc-abf4-655f-bf67-946fc0f9f25b" TYPE="ext4"
### Wiping cache
~ # twrp wipe cache
Formatting cache using make_ext4fs...
Failed to mount '/cache' (Invalid argument)
Done processing script file
~ # mke2fs -t ext4 /dev/block/mmcblk0p27
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
44832 inodes, 179200 blocks
8960 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=184549376
6 block groups
32768 blocks per group, 32768 fragments per group
7472 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840
Allocating group tables: done
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
~ # twrp reboot
command is: 'reboot' and there is no value
Failed to mount '/data' (Invalid argument)
Failed to mount '/data' (Invalid argument)
E:a
Done processing script file
**Question**: How to at least get the content of my Nexus 5's /sdcard saved to a computer? Or maybe even fix the Nexus if possible?
[1]: https://i.sstatic.net/OOKWF.gif