[LG V30 ROMs, Kernels, Recoveries, & Other Developm] jcadduono:
Thanks a lot!

A quick inspection notes the following:

CAF tag: LA.UM.5.8.r1-02200-8x98.0-1 = refs/tags/AU_LINUX_ANDROID_LA.UM.5.8.R1.07.01.02.290.022

Board codename: joan

Unlike previous variants, it is NOT using a dtb.img but instead the standard Image.gz-dtb format (gzip -9 < Image > Image.gz && cat Image.gz *.dtb > Image.gz-dtb)

Standard gzip+cpio ramdisk

jc@draenor:~/Downloads/lg-v300s-v10j/LGMV300SAT-00-V10j-SKT-KR-SEP-16-2017-64G+0$ bootimg vv boot_4.img
BOARD_MAGIC ""
BOARD_CMDLINE "console=ttyMSM0,115200,n8 androidboot.console=ttyMSM0 user_debug=31 msm_rtb.filter=0x237 ehci-hcd.park=3 lpm_levels.sleep_disabled=1 sched_enable_hmp=1 sched_enable_power_aware=1 service_locator.enable=1 swiotlb=2048 androidboot.configfs=true androidboot.usbcontroller=a800000.dwc3 androidboot.hardware=joan buildvariant=user"
BOARD_PAGESIZE 4096
BOARD_BASE 0x00000000
BOARD_KERNEL_OFFSET 0x00008000
BOARD_RAMDISK_OFFSET 0x02000000
BOARD_SECOND_OFFSET 0x00F00000
BOARD_TAGS_OFFSET 0x00000100
BOARD_KERNEL_SIZE 19069782
BOARD_RAMDISK_SIZE 7370445
BOARD_SECOND_SIZE 0
BOARD_DT_SIZE 0
BOARD_HASH 0xefa953a47d291ccf70d7eba9f3bb5c12da03e8ff

jc@draenor:~/Downloads/lg-v300s-v10j/LGMV300SAT-00-V10j-SKT-KR-SEP-16-2017-64G+0$ bootimg vv recovery_4.img
BOARD_MAGIC ""
BOARD_CMDLINE "console=ttyMSM0,115200,n8 androidboot.console=ttyMSM0 user_debug=31 msm_rtb.filter=0x237 ehci-hcd.park=3 lpm_levels.sleep_disabled=1 sched_enable_hmp=1 sched_enable_power_aware=1 service_locator.enable=1 swiotlb=2048 androidboot.configfs=true androidboot.usbcontroller=a800000.dwc3 androidboot.hardware=joan buildvariant=user"
BOARD_PAGESIZE 4096
BOARD_BASE 0x00000000
BOARD_KERNEL_OFFSET 0x00008000
BOARD_RAMDISK_OFFSET 0x02000000
BOARD_SECOND_OFFSET 0x00F00000
BOARD_TAGS_OFFSET 0x00000100
BOARD_KERNEL_SIZE 19069782
BOARD_RAMDISK_SIZE 13043351
BOARD_SECOND_SIZE 0
BOARD_DT_SIZE 0
BOARD_HASH 0x7be0d1797b9ebf10a3afa49bac79973b148f0078

fstab.joan:

#<src> <mnt_point> <type> <mnt_flags and options> <fs_mgr_flags>
/dev/block/bootdevice/by-name/system /system ext4 ro,barrier=1,noatime wait,verify
/dev/block/bootdevice/by-name/cache /cache ext4 discard,nosuid,nodev,barrier=1,noatime,noauto_da_alloc,errors=continue wait,check
/dev/block/bootdevice/by-name/userdata /data ext4 discard,nosuid,nodev,barrier=1,noatime,noauto_da_alloc,errors=continue wait,check,forceencrypt=/dev/block/bootdevice/by-name/encrypt
/devices/soc/c0a4900.sdhci/mmc_host* auto auto nosuid,nodev wait,encryptable=/dev/block/bootdevice/by-name/encrypt,voldmanaged=external_SD:auto
/devices/soc/a800000.ssusb/a800000.dwc3/xhci-hcd.0.auto/usb* auto auto defaults voldmanaged=usb:auto
/dev/block/bootdevice/by-name/misc /misc emmc defaults defaults
/dev/block/bootdevice/by-name/ftm /ftm emmc defaults defaults
/dev/cnas auto auto defaults voldmanaged=cnas:auto

default.prop

#
# ADDITIONAL_DEFAULT_PROPERTIES
#
ro.oem_unlock_supported=1
ro.secure=1
security.perf_harden=1
ro.adb.secure=1
ro.allow.mock.location=0
ro.debuggable=0
persist.sys.usb.config=boot
persist.healthd_msm.log_en=true
persist.service.chg_mode=LGE,QNOVO
ro.zygote=zygote64_32
pm.dexopt.first-boot=interpret-only
pm.dexopt.boot=verify-profile
pm.dexopt.install=interpret-only
pm.dexopt.bg-dexopt=speed-profile
pm.dexopt.ab-ota=speed-profile
pm.dexopt.nsys-library=speed
pm.dexopt.shared-apk=speed
pm.dexopt.forced-dexopt=speed
pm.dexopt.core-app=speed
dalvik.vm.image-dex2oat-Xms=64m
dalvik.vm.image-dex2oat-Xmx=64m
dalvik.vm.dex2oat-Xms=64m
dalvik.vm.dex2oat-Xmx=512m
ro.dalvik.vm.native.bridge=0
dalvik.vm.usejit=true
dalvik.vm.usejitprofiles=true
dalvik.vm.appimageformat=lz4
debug.atrace.tags.enableflags=0
#
# BOOTIMAGE_BUILD_PROPERTIES
#
ro.bootimage.build.date=Sat Sep 16 19:35:59 KST 2017
ro.bootimage.build.date.utc=1505558159
ro.bootimage.build.fingerprint=lge/joan_skt_kr/joan:7.1.2/N2G47H/172591935884a:user/release-keys

I am starting kernel source setup now

If you're wondering, yes, I am genuinely interested in buying the B&H Photo LG US998 model (carrier free, hopefully bootloader unlocked) and no I have no interest in bootloader locked devices :)