links dont workI hesitate to respond to this because it has been covered again and again. Sim lock and bootloader lock are entirely different. You should strongly consider purchasing a sim-unlock code and applying it before flashing another rom to a carrier branded phone! There are instructions in one of the threads on how to get out of this pickle. It involves flashing a v35 rom for Mexico region.
Boot+TWRPv3.3.1_only-V35-Pie-ULM20F.img - boot.img from latest V350ULM20f firmware