[LG V30 Questions & Answers] Mad Medik:
Hi folks,

I'm looking for some guidance.

Background:

I bought an H933 in Canada. I successfully converted it to a bootloader unlocked, Magisk rooted US998 on Oreo.

I had hoped to convert back to H933 while keeping TWRP so I could take advantage of network dependant features such as VoLTE, VoWIFI and RCS. I was able to get back to H933 Oreo with TWRP but lost data connection. The last attempt involved using the DD command to copy modem files over from a stock H933 dump, which resulted in losing cellular connection all-together. I attempted to change back to a working phone by doing a Partition DL flash with LGUP and am now stuck staring at the LG Life's good logo.

Okay, so I have been attempting simply to revert back to a working device and am stuck and looking for some help.

I can access recovery (TWRP), download mode and fastboot mode. I cannot boot into the system (it boots to the LG Life's Good logo and hangs).

I have tried a master reset, a TWRP factory reset and wipe data, LGUP Partition DL to various images (US99810d, US99820a, H93310h, H93320f, H93320g) as well as trying the refurbish option on the same images. I have a TWRP backup of an US998 which appears to successfully restore, I have a flashable US99820e zip which appears to flash properly. In every case, I wind up either with a slow bootloop after reaching the LG Life's good logo, or just hanging at the LG Life's Good logo indefinitely.

I am at a loss as to what to try and beyond my understanding with LG.

Below are my notes up to where I started trying to get the phone back in case that helps...

Thanks all.

UPDATE: I have been able to get a network connection with data back. As far as I can tell, the series of events that resulted in the fix was LGUP Partition DL (ALL partitions) to US99810d. Then, while attempting to boot into recovery, I did a master reset. I followed this with LGUP REFURBISH US99810d and then another master reset.

So it may have been doing a partition DL (ALL)/reset/Refurbish/reset and using the same bin file for both that might have done the trick. Interestingly, I tried this early on but using the same H93320f rom I had already flashed, and then again with the H93320g rom without success. Maybe someone with more insight can shed some light but I'm going to toss out a hypothesis that I needed to use an image that had different partition sizes from the one I was on to force it to fix whatever the problem was?

Anyhow, I'll leave this up in case someone else runs into the same problem.

Thanks.

Nov 28

- Download mode

- LGUP - Part DL - H93320F - "ALL"

- Bootloop with flashing android (expected)

- Master reset

- Boots and has no data connection... FFS!!!

- Download mode and restarted LGUP. Still showing US998e.

- LGUP Refurbish with H93320f - FAIL

- error, does not support cross model... sigh...

- Try part DL - H93320f - "all" again

- completed. It booted into system this time. Still no data

- skip through setup then SIM update, APN refresh, confirm mobile data activated. No data connection. Force roam and confirm roaming data on. No data.

- Reboot. Same.

- boot to Download mode

- LGUP now detects H93320F

- LGUP refurbish with H93320f - proceeds

- reboots system.

- gets to welcome screen and then instantly reboots.

- Gets to welcome screen and... Data connection!

- Power off, connect to Downloader mode

- error - Not enough free HDD disk space (0 MB), need more than 0 B

- ^%$&&^!!

- exit LGUP and restart. Works this time...

Frankenstein process:

- Downloader mode

- LGUP Part DL US99810d - "ALL"

- Boots into flashing android (as expected).

- Master reset

- Boots to welcome. Data connection present - US english & changed data logo.

- Power off and into download mode

- restart LGUP - still shows H93320f ??

- LGUP - Part DL US99820a - "ALL"

- reboots to welcome. Data confirmed.

- Skip through setup. Enable Dev options. Observe "OEM Bootloader is already unlocked"

- Enable USB debugging & photo transfer mode. Connect usb

- Open cmd window.

- adb devices. Authorize USB debugging. adb devices - success

- adb reboot bootloader

- fastboot flash recovery twrp.img - success

- fastboot boot twrp.img

- Boots into TWRP.

- swipe to allow mods

- Confirmed backup present on SD card

- Wipe Data - factory reset

- Wipe data - Format Data. Observe errors

- back to TWRP menu, reboot - reboot to recovery

- Wipe, format data. No errors

- Back to TWRP menu. Reboot - reboot recovery

- Install. Selected External SD. Install Magisk 17.3

- Install no verity

- Install LG-rctd

- Reboot to system - welcome. (Confirmed data connection)

CHRISTPHERGGG & CLOUD1250000 INSTRUCTIONS:

- Download mode

- Connect to LGUP (Note - shows US99820a.)

- Part DL H93320f - ALL, then recovery unchecked

- Phone boots into TWRP

- Wipe - Factory reset. Lots of red (failed to mound /data unknonwn error 150, unable to mount storage (expected I think)

- Wipe - Format Data - done with no errors.

- Reboot to recovery

- Install. Flash No verity, Flash lg-rctd, then Magisk. No errors, appears successful.

- unplug from system.

- TWRP reboot menu - power off

- Download mode

- Observe LGUP - still shows US99820a ???

- LGUP - Part DL H93320f (clear all, then select recovery only)

- phone reboots 3 times?

- Boots to welcome (canadian. Network connect but no data)

- skip through setup. Enable Dev mode. Observe OEM unlock is off? Turn on. Enable USB debug.

- Magisk manager - needs data. Connect to wifi. Go throgh Magisk update and setup.

- Connect to USB. Authorise Debug. Change to file transfer mode.

- Copy twrp.img, modemst1_COM3, modemst2_COM3 to root of internal storage on V30

- adb devices - (connection confirmed)

- adb shell

- su (grant forever on device)

- dd if=/sdcard/twrp.img of=/dev/block/bootdevice/by-name/recovery (appears to copy successfully)

- (DD of modemst1_COM.bin errored, not found. Figured out that they did not have .bin extension. Edited dd command to match file name.)

- dd if=/sdcard/modemst1_COM3 of=/dev/block/bootdevice/by-name/modemst1

- dd if=/sdcard/modemst2_COM3 of=/dev/block/bootdevice/by-name/modemst2

- both appear successful

- Magisk, modules, reboot to recovery.

- Successful boot to TWRP.

- Reboot to system

- "Service Disabled" and an X over the signal bar.

- skip into system. Enable data. Try to text for SIM update - failed to send.

- Master reset reboots to TWRP. Factory reset & format data. Reboot

- Wecome screen with X over signal. Screen freezes an device reboots.

- Welcome screen with X over signal. Try to proceed with mobile data - no network.

*** How does DD work. Maybe the second half is just a location but the name remains the same and needs to be .bin??? ***

Restart from beginning. Try changing file name to modemst1.bin & st2.bin

- LGUP Part DL US99810d - ALL

- Master reset

- Bootloop. Can't get to download mode or Recovery.

- Get to fastboot with Power & vol down. Release both on logo and press both again? Not sure exactly

- Flashed recovery

- Boot to recovery, factory reset. Wipe data. Reboot recovery. Wipe data. Reboot recovery. Try restore image.

- Reboot to download mode

- Refurbish US99810d. Success. Data is back.

- reboots into welcome.

- *** Curious. Since refurbish, LGUP detects it as US99810d. Maybe Upgrade works now? *** Testing.

- LGUP UPGRADE US99820a - Success.

- Steps to install TWRP, verity, rctd. Boots to system

LGUP detects as US99810d but phone confirms US99820a

refurbish. No change.