For people who want to switch on US998 30b and have problems
METHOD #4
no difference, locked or unlocked bootloader
simple and safe, working 100% ( others didn't work for me except METHOD #3, but the download mode does not work there )
You must be on US998 firmware, no matter, NOUGAT or OREO and you needs files:
1. H93310h_00_OPEN_CA_OP_1124.kdz
https://lg-firmwares.com/downloads-file/12260/H93310h_00_OPEN_CA_OP_1124
2. US99820h_00_0318.kdz
https://lg-firmwares.com/downloads-file/19157/US99820h_00_0318
3. US99830b_00_0902.kdz
https://lg-firmwares.com/downloads-file/20723/US99830b_00_0902
4. LGUP patched
https://forum.xda-developers.com/attachment.php?attachmentid=4828349&d=1569503757
Steps:
LGUP must recognize your V30, V30+ like US998 model, if not - first flash any US998 firmware in any possible way, reopen LGUP, reboot phone, reconect usb-cab, etc
Its very important, again,
LGUP must recognize your V30 like US998 model
if Yes - do the following ( it will take about 10 minutes )
do not close LGUP and don't let phone turn on completely until the process is completed!
We do everything exactly on points
1. Flash H93310h_00_OPEN_CA_OP_1124.kdz via LGUP using Partition DL mode ( check all partitions), when phone automatically restarts - immediately do hardreset using the buttons, keep hold Vol. up button, we get download mode again
2. Flash US99820h_00_0318.kdz using REFURBISH mode, when phone automatically restarts - just wait "Erasing" screen and now immediately keep hold Vol. up button, we get download mode again
3. Flash US99830b_00_0902.kdz using UPGRADE mode ,
at this stage the phone will boot normaly and you finally get 9.0 Pie.
Next step is optional, but strongly recommended
4. Flash US99830b_00_0902.kdz again using REFURBISH mode, and now you have clearly fully stock.
Done ! Congratulations.