[LG Stylo 2  ROMs, Kernels, Recoveries, & Other Dev] y3kt:
I can provide a stock boot.img I have for LS775 ZV5 build, but cat /proc/cmline is useless right now. I do get some output with cat /proc/partitions and cat /proc/mounts

major minor #blocks name

253 0 485204 zram0

179 0 15388672 mmcblk0

179 1 512 mmcblk0p1

179 2 512 mmcblk0p2

179 3 512 mmcblk0p3

179 4 512 mmcblk0p4

179 5 2048 mmcblk0p5

179 6 1536 mmcblk0p6

179 7 512 mmcblk0p7

179 8 512 mmcblk0p8

179 9 512 mmcblk0p9

179 10 512 mmcblk0p10

179 11 2048 mmcblk0p11

179 12 16384 mmcblk0p12

179 13 16384 mmcblk0p13

179 14 512 mmcblk0p14

179 15 1536 mmcblk0p15

179 16 1536 mmcblk0p16

179 17 24576 mmcblk0p17

179 18 24576 mmcblk0p18

179 19 24576 mmcblk0p19

179 20 24576 mmcblk0p20

179 21 1536 mmcblk0p21

179 22 512 mmcblk0p22

179 23 512 mmcblk0p23

179 24 512 mmcblk0p24

179 25 512 mmcblk0p25

179 26 512 mmcblk0p26

179 27 512 mmcblk0p27

179 28 512 mmcblk0p28

179 29 8192 mmcblk0p29

179 30 32768 mmcblk0p30

179 31 10240 mmcblk0p31

259 0 8192 mmcblk0p32

259 1 8192 mmcblk0p33

259 2 65536 mmcblk0p34

259 3 1024 mmcblk0p35

259 4 2560 mmcblk0p36

259 5 2048 mmcblk0p37

259 6 6144 mmcblk0p38

259 7 40960 mmcblk0p39

259 8 3207168 mmcblk0p40

259 9 921600 mmcblk0p41

259 10 10915840 mmcblk0p42

259 11 8175 mmcblk0p43

179 32 4096 mmcblk0rpmb

rootfs / rootfs ro,seclabel,relatime 0 0

tmpfs /dev tmpfs rw,seclabel,nosuid,relatime,mode=755 0 0

devpts /dev/pts devpts rw,seclabel,relatime,mode=600 0 0

proc /proc proc rw,relatime 0 0

sysfs /sys sysfs rw,seclabel,relatime 0 0

selinuxfs /sys/fs/selinux selinuxfs rw,relatime 0 0

debugfs /sys/kernel/debug debugfs rw,relatime 0 0

none /acct cgroup rw,relatime,cpuacct 0 0

none /sys/fs/cgroup tmpfs rw,seclabel,relatime,mode=750,gid=1000 0 0

tmpfs /mnt tmpfs rw,seclabel,relatime,mode=755,gid=1000 0 0

none /dev/cpuctl cgroup rw,relatime,cpu 0 0

pstore /sys/fs/pstore pstore rw,relatime 0 0

/dev/pstore /dev/pstore pstore rw,relatime 0 0

adb /dev/usb-ffs/adb functionfs rw,relatime 0 0

/dev/block/bootdevice/by-name/system /system ext4 ro,seclabel,noatime,data=ordered 0 0

/dev/block/bootdevice/by-name/cache /cache ext4 rw,seclabel,nosuid,nodev,noatime,noauto_da_alloc,errors=continue,data=ordered 0 0

/dev/block/bootdevice/by-name/userdata /data ext4 rw,seclabel,nosuid,nodev,noatime,noauto_da_alloc,resuid=1000,errors=continue,data=ordered 0 0

/dev/block/bootdevice/by-name/persist /persist ext4 rw,seclabel,nosuid,nodev,noatime,noauto_da_alloc,errors=continue,data=ordered 0 0

/dev/block/bootdevice/by-name/modem /firmware vfat ro,context=u:object_r:firmware_file:s0,relatime,uid=1000,gid=1000,fmask=0337,dmask=0227,codepage=437,iocharset=iso8859-1,shortname=lower,errors=remount-ro 0 0

/dev/block/bootdevice/by-name/sns /sns ext4 rw,seclabel,nosuid,nodev,noatime,noauto_da_alloc,errors=continue,data=ordered 0 0

/dev/block/bootdevice/by-name/drm /persist-lg ext4 rw,seclabel,nosuid,nodev,noatime,noauto_da_alloc,errors=continue,data=ordered 0 0

/dev/block/bootdevice/by-name/mpt /mpt ext4 rw,seclabel,nosuid,nodev,noatime,noauto_da_alloc,errors=continue,data=ordered 0 0

/dev/block/bootdevice/by-name/carrier /carrier ext4 rw,seclabel,nodev,relatime,noauto_da_alloc,data=ordered 0 0

tmpfs /storage tmpfs rw,seclabel,relatime,mode=755,gid=1000 0 0

/dev/fuse /mnt/runtime/default/emulated fuse rw,nosuid,nodev,noexec,noatime,user_id=1023,group_id=1023,default_permissions,allow_other 0 0

/dev/fuse /storage/emulated fuse rw,nosuid,nodev,noexec,noatime,user_id=1023,group_id=1023,default_permissions,allow_other 0 0

/dev/fuse /mnt/runtime/read/emulated fuse rw,nosuid,nodev,noexec,noatime,user_id=1023,group_id=1023,default_permissions,allow_other 0 0

/dev/fuse /mnt/runtime/write/emulated fuse rw,nosuid,nodev,noexec,noatime,user_id=1023,group_id=1023,default_permissions,allow_other 0 0

Have you been able to achieve some progress? If you need to try I have some time and one of these phone to try. I really need root on this version.