I don't know if you guys know that, but you can also disable thermal throttling and brightness reduction with that combo too.
It's very simple to do! just use the combo which was used to disable ota (thanks LG Fanatic

) Then once the hidden menu pops up, navigate to the POWER menu, then go to high temperature property, in there, change high temp prop OFF to enabled, then head back to the power menu, scroll down until you find thermal daemon mitigation,tap on it, then change thermal mitigation to disabled.And Done,no GPU/CPU throttling and brightness reduction to prevent overheating anymore. Tested here and did not see any increase in heat over stock settings. It even increased my antutu score from 21635 to 22768! Not to mention that the phone is more responsive overall.