Five things to note before we get started:
1. I wouldn't try this on devices other than H930DS. You've been warned.
2. You cannot go back to previous Oreo firmware if you do this.
3. You must lock your bootloader before you attempt this upgrade (if you unlocked it)
4. Must be on THIS firmware otherwise the operation will not work.
5. In Android Pie Beta for the V30, there are some languages missing in the settings. English is there though.
Now that that's out of the way, let's do this.
Step 1: downloads
Download Pie beta OTA for the H930DS
The file is 1.8 GB.
Download these necessary files (LGUP & drivers) here
Step 2: Preparation
Once you downloaded the zip (thanks to @PilyTam by the way), extract the files to a location of your choice.
Then, install LGMobileDriver_WHQL_Ver_4.2.0.exe, LGUP_Common_DLL_Ver_1_0_28_5.msi , and LGUP_Store_Frame_Ver_1_14_3.msi
The only file that you haven't touched yet is another zip - LGUP V30DLL_PATCHED.zip . Extract the files to where LGUP is installed. By default it will be in C:\Program Files\LG Electronics\LGUP . Replace the files when prompted.
Step 3: Proceeding with the update
Make sure your device has "USB Debugging" enabled in the settings. You can find this option in developer settings.
To enable developer settings:
Go to settings > general > about phone > software info
Now tap "build number" until you see the "you are a developer" message.
Connect your V30 to your PC.
Choose FOTA Upgrade
In file path, click on the three dots and find the OTA update - H930DS-V22j-HKG-to-H930DS-V29g-HKG.up
And finally, click Start.
It will appear to be stuck at 4% for some time with the message saying "Flash package" (at least that's what happened to me), but don't panic, just let it do its thing. When the LGUP program says the operation has succeeded, you still have to wait for your V30 to actually apply the update. It will say "FOTA EASY UPDATE" in big blue letters on your screen. And it will take some time to apply the update.
Thanks for reading and good luck everyone. I hope my guide was clear enough. If you need any help I'll do my best to assist you.
Here are some screenshots.