Is it possible to re-enable download mode after nuking it?

[creeperlord1999]

I was trying to flash a custom rom on my Lg G7 Thinq with twrp but the flash failed, leaving my phone without a rom, I didnt make a backup so i dont have that fall back to and i had to nuke download mode to get fastboot to work in pie. but now it seems download mode is the only thing i can do to save this phone, but i cant find anything talking about how to get download mode working again