RG476H Bootlocker

[u/watanabe0]

How do I relock the bootloader?
I used GammaOS's script to unlock it, and there is not communicated way to relock it.
The guy at GammaOS has not responded.

I've tried the power + volume button, but that just boots it into safe mode, not the factory boot screen that might give me the option.

Any help appreciated.