LG G7 ThinQ LM-G710AWM - Unable To Fastboot To Unlock Bootloader - Android Q&A, Help & Troubleshooting

My friend has LG G7 ThinQ G710AWM 20d, Android 9, and I'm unable to enter into fastboot or recovery mode because I plan to wipe and install a custom ROM without all the bloatware and spyware. Tried ADB, button combos, etc. No luck. I've successfully rooted and modded other phones but I am stuck with this varient, please help!
UPDATE:
I think I need to cross flash to Android 8 Oreo, I am stuck at which firmware to flash from the LG site, there's a bunch of them listed for the model G710AWM all having different versions.

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