How to make a pak file?

Hello there, im trying to make borderlands3 run on my low end pc. And by that i mean that i edited the Basescalability.ini file for some graphix tweaks.
Im searching everywhere but i cant find a guide on how to repack the modified files back into a pak file.
I tried doing it myself but it said “Failed to open descriptor file …/…/…/OakGame/OakGame.uprojects”
I bet this question is asked here alot from us noobs, but if somebody knows please please let me know.

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